Malicious PDF — malware analysis report

Static analysis result for SHA-256 86caf93d7bf3db58…

MALICIOUS

PDF

92.0 KB Created: 2021-09-05 20:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: a6bed746c460a7067268bb200bb5b338 SHA-1: 9c247e6f7efe4a7fc18a2ca7998b5da1874cd487 SHA-256: 86caf93d7bf3db58ea98f02b823c9216356b4d32865dfd2b598f95e386b8ab57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f7bf6b7c8cc75c05e7f7a2fc861b4b1/sajubegew.pdf In PDF document text
    • http://miamiokclassof65.com/clients/d/db/dbefc63a503cf3d3a4f9fb61678ecc08/File/79004640026.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/benufigijuzimimezifapeku.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3380b71e02fa8556e1b025430f2dc52d/pixovekusanexovuse.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/76277598803.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/95344711903.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dozakewawefikusabusuduze.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f29eae01c---biliravoxadevesezunil.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160759e2b6df5d---bigutoxanopu.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/4642175034.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/37761002125.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/dilodagabovumonuxef.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/lanupurefekufutaxab.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/sekobokese.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/68106251335.pdfIn PDF document text
    • https://vieclamxaydung24h.com/upload/files/vukalagofopadekazi.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/8gmi8frh8r25n6akmjhtm3c4d7/84283745335.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/31b8e7eb3e971313e0510df5535ea22c/gogonukilifefizekagepuw.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcb645249f---37383528937.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d84198a6f6---kepibigotufagan.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/63509752071.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b16473eaec---7110936768.pdfIn PDF document text
    • http://cauthinh.com/luutru/files/morokafigoruzadupexilage.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e0c64531c---15680589093.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/vasorobis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=nikon+fe+service+manualPDF 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_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 18308 bytes
SHA-256: b254bcce7fc28d36f55b25de39da5e6b1e15498bd631f7856ef8d66d466eaae3
font_01_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 10632 bytes
SHA-256: c2b0b20b7d261a0b9df359feb75ee54b8f695fb5bb40186fc8ed53d5cb61496b
font_02_sfnt_off000149bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1