Malicious PDF — malware analysis report

Static analysis result for SHA-256 be66ef36d6043762…

MALICIOUS

PDF

84.8 KB Created: 2021-08-16 23:05:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 324e41ec5f545325fa6cac5039322bbc SHA-1: 8cfbbddb6cff621cf9faf2b8184c39dca3587432 SHA-256: be66ef36d60437628289bedb57ca450be825c32f713e7eb1525d33cf69e8fed6
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of 'wkhtmltopdf' in the metadata indicates it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://trekkingsapatours.com/upload/files/22588475923.pdf In PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3db53b96f4---juzuwipefakonedijeve.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/sepipada.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/xapoligeduniwenesil.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/9006cd5e8e656eee197bf34b0016f093/70458441396.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/72040265307.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609305b284182---fopigadexad.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/53471171823.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/66a74a7e97b3fb3613d3d90bf3148abe/2669364533.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/32179015580.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095cea0e11a0---zigujubowologalafo.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/babenuxegogawifodofizusa.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ck56rnhqca1oea1q3s4uuvmdom/jafopukukuvaraxogajuta.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/fc4c791b13d8b58f272c3fe58b0ac467/6744209799.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/9567a0b794643b25860f891d33d05015/pinadojaxub.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/lupun.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/78696679119.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d26df0371---43060137929.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0a97ec94dfd0c2562046b10133362515/ninivekobijob.pdfIn PDF document text
    • http://amandamaitland.com/images/file/74800247547.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde8d1e1fa2---motusanamitixapetiwanu.pdfIn PDF document text
    • http://e-hematologica.pl/users/file/vitagenowefowuxode.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e3ba401de9b341cfd5092db62065469a/36747366538.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/95372919417.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/45267547844.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a8d272318---76045122378.pdfIn PDF document text
    • http://www.rlktechniekIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=proyeccion+de+caballete+del+propanoPDF 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_off0000e301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE301 18408 bytes
SHA-256: c5bf0549f5b455dbb6138854be2bd7c8a00e9b15d25ab8f2e97422e0dc6aca7d
font_01_sfnt_off0001126a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126A 10596 bytes
SHA-256: 369462f4896afbdbc75556efc7e7ac8473579f797e1f61311028913cc42f5f31
font_02_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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