Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce669d89a88528bf…

MALICIOUS

PDF

90.6 KB Created: 2021-06-29 07:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4589fb967c7345e0f892f5e67ff8b671 SHA-1: c72ef324059f6123d1917e8831c4040baf6be09d SHA-256: ce669d89a88528bfec6e757a26e9cff5411af6083d8a5fa677051246f96f1e0f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm designed for SEO manipulation, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests these links lead to malicious content hosted on compromised sites. The embedded JavaScript likely facilitates the redirection or further payload delivery, and ClamAV detection confirms its malicious nature. The overall pattern suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/o9kbfuob1fj2nhvs6jepd7gehd/jenategusije.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/nle5fabp98hg94s2d9h5ls51pa/delulag.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/c0d4c6ca8efd41c073ba07f92fc98947/sogobadakodam.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c056609a980---rejuporetiri.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083dbe109fb7---xofusaburatewuvopuka.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/fqvc9ai46j3asabuhcm14pm77j/40422164518.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ftbjl358tnarv0u199nt1i1ls8/81832364243.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210605_76C95A84A865A637.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/45b77f0b0c62ad7611e13d45f7b563be/xoxewikuwifiwolonok.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/fijawerax.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/58022efc2cb88d2a1bf24179a96c2551/panukeni.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/81172220850.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10889cdbaa---jekaruvirimifebalip.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9ae12014---fibepukiz.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/j5feeq65llv1e175ub8h7ldp1b/32477345865.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/92895337832.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/59064334550.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/81317867131.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/aau03a97upopcrffqrs56o5ko5/nozefaxeboludizakitonutu.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/37545034984.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/50217145333.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/wunibufem.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/49e9af501e659f74623b4157367cfba6/27262961312.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/8khig6vvh5j13okbs1veg578va/87574773541.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c07ee7dd330---somakuzilomuzuwunojozak.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceda2f1e5d---gumevula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=greenville+county+detention+center+inmate+searchPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 10952 bytes
SHA-256: 530d416d175aec25dd12ea93c2699e06694a62a6ec1bbb43285c7e100a3ca869
font_01_sfnt_off000117f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F2 16976 bytes
SHA-256: 177e9042b0cbc22b4c1ba1ee0beabc4a0eff776dd663b86fb0d28f5e110c303d
font_02_sfnt_off00014475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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