Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d610334c7e47cce…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 09:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6cbca0f8957eb464f1563c48e33efa14 SHA-1: 77bb2c06f9d21ed56d89fe675a4d8a4bcd3dbe22 SHA-256: 2d610334c7e47ccecb2484643a50f0bb36920a537e7117038710ff43f75e7a40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting malicious PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=tepung+kacang+tanah+pdf PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/bced6adb94687ec3c61b0d6591073f3e/rojipuredirasosalepifimi.pdfIn PDF document text
    • http://wajl.net/img/file/2021789643.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/maburepubufepes.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/28615116824.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/bepegod.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611037588b314---forumekupu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea4a3e793---43069402433.pdfIn PDF document text
    • http://riversedgefm.com/files/file/57640229337.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c970a84735---vomow.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607695e196d56---pukamibejelago.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161236fb851158---ligaxatat.pdfIn PDF document text
    • http://hrudolf.com/userfiles/25356906814.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160aebf08c36d0---xetefiroxuwu.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/96808655317.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/92228190824.pdfIn PDF document text
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/85461463989.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/lajuruvijepuvijufasose.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ff465f15baa---tubej.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/45685735710.pdfIn PDF document text
    • https://aayams.com/userfiles/file/95848806246.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622839561.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/0un4mgtaj9o3k1g95lkk4urmq6/kikukokobewoduzevuzej.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160d18d70f23c6---zelunuvali.pdfIn PDF document text
    • 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_off0000d617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD617 20116 bytes
SHA-256: 6ebf72e805c29a9252daf293fa7ab58f097bc6aa5024ee9bc55d198fc569bf17
font_01_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12301 10528 bytes
SHA-256: 0d245d583a1974356bc5f5518c30f04fa8825cbbd5faefb8487db8a88312a7dd

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