Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a82f5901f0cb98…

MALICIOUS

PDF

86.3 KB Created: 2021-08-02 12:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2c3c4310774951cb13f425e732c45bc0 SHA-1: adbebb0d383b110eb9078e2ec36f32b036c920c2 SHA-256: 10a82f5901f0cb98322e27517ea89f28e523f8f1ef793cba3207113b0820e332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers identified this PDF as malicious, specifically flagging it as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/bgalp0e1ujpl7njphu03mgj0j1/39173021369.pdf In PDF document text
    • http://c-amc.com/upload/files/66952056325.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/moragujobifawemedoro.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/9ncnjc270is873k3f3o3atm0ng/77722355152.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094128664ae1---zokomonitoviwa.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bfcee7906---30134180505.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/junuv.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16088bb086f9f1---21669044665.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/bavojukirowebiwi.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/15542539033.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/v1pc0pu030f8fp83a7th738583/soxolodarabulidevivadoba.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087660597055---gogatanipowumuxan.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086212e126f3---japapi.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/37ed0b83b5c96880bd49707918295d1b/71371594712.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe574d23c89---24917447579.pdfIn PDF document text
    • https://bursac.net/userfiles/file/49934534269.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/1ae45cbd72b3bee67b283e0adec47cf0/55099205242.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/30650672717.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/179bef20f4c2a30ab2bbfcdb26b2aeec/biregus.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/62a8f4e4857f5e01d93e7712b928e5c7/69616068390.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/6423424525.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/21899981357.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/34016484516.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7af6c7517f---11069880099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+do+you+become+a+certified+ophthalmic+assistantPDF 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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 17144 bytes
SHA-256: 5fdb0a42fc29ecdae7a67ab38875ec10223f33064c59436e0f7f6b41dd4064e1
font_01_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 11316 bytes
SHA-256: df325f7ff8f7e05b37e21e11676df5311a59db22274518bcac410f05a1293cfe
font_02_sfnt_off000132f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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