Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13b8c78b3d1044c…

MALICIOUS

PDF

87.7 KB Created: 2021-06-27 17:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: be05de310645b5e0a37b9469e4830b83 SHA-1: cbf3957c46ca3b714bacad62ba5633f834aaee26 SHA-256: c13b8c78b3d1044c5845e60634bde106fc4bdfbdde7e4854488a82905d558f93
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress upload storage and other disposable hosting sites, suggesting a link farm used for phishing or malware distribution. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pattern, aiming to trick users into interacting with malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://laborke.ru/uplcv?utm_term=delineator+meaning+in+tamil PDF link annotation
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/5aa735872d735db81309f577818ceef7/jatomise.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9cfd6c4f3e---8542583463.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/41581779708.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/cf5b0265282326f2050229c335b2334c/45143156358.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608172511512a---10998584971.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0a7bc4835---71896307554.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9d33aca55993587aa358786f8f792f23/muwujopewunagiv.pdfIn PDF document text
    • http://geotersrl.it/file/labalasarajipu.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/tixovamokowiwi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d335efeaf---87593097158.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bffedf0bd1f---jejikaluxefofakemosuf.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8c6b3fce3---bujavuvuvob.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d643726b43---1948526565.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f5f448588---dewidisozuva.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/56205501033.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/i1idhmklbb1cph9g789g5e76af/buditol.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b865b0af9ba---rilidapuw.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160753a74b2b54---jawifesiziwiti.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/0182307348a9a80ece7e9f66e288b354/loxujamotizevuf.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a55dc555454---47125316862.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/birewuvemigadu.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffe8cc57a0---fikupifejekukap.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/gevetusojog.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160884a48e1f48---situf.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b7958d50904---kapajisukalut.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dbd58f8c3---mebetoton.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE625 10284 bytes
SHA-256: 562bf89d84d7462d2ce2048db5d7524a69c1c48867f1234ca03a9acc91303ef8
font_01_sfnt_off0000fd30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD30 3696 bytes
SHA-256: 63122d947dc9db2e6dd6346a3d55549b5e8f4284e46c323e3fb7a173ccb018b9
font_02_sfnt_off00010b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12374 17964 bytes
SHA-256: 91011255aca0f727fc60114c7528ba3fbf67edfebf23a2c6e3f53d1c3c8b75df

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