Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e6df17fc0652f9f…

MALICIOUS

PDF

96.2 KB Created: 2021-08-21 09:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e1df0c83186a9b57823eb5f7d5d49e77 SHA-1: acf841cf6c9132629689597ac2e2458693eedfd9 SHA-256: 8e6df17fc0652f9f88198de4f8faaab496a75a02c1d5b2164a511a189b11e718
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 0.9992

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 http://4reality.cz/userfiles/files/14663662363.pdf In PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210701_28C2E0CF95BB2A24.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/fegaromifumewuxesenowebin.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/f0bh3nfvd1f49fussm5eu2ruf4/ziredazabu.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/rabutiviniturosipibato.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/wamavodokatorezidapebo.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4b5bed20ac9b6bcf1ce12b698c01740c/zovig.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop//contents/tibujivadibebepuvona.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/dc3cce1cdd1372df57513c7397ef332f/nubewagenibupu.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/eb442b07918ca38f6ae4e94367588ea0/51091175548.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b668209a33---jotekudugidozu.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/f1b3b0ecae2929756807952bc362bf78/94926263526.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/49854077489.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/maxofafaxerabikof.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160720a69d8883---rajowonaxuremozivetumapel.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/jazoweziku.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e275a21b6---9182102018.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/xoxatilamagasifotumutinok.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/22099716046.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/171e3f251c6e28515ce3e5839141dda4/mutop.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093a574391be---lubozolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=proverbs+quiz+questions+with+answers+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00010dfa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10DFA 18924 bytes
SHA-256: ad32b0fcef9ee552226f0f61aa5c2f8a5f02ad082a76e554b64d96f5b3be8ede
font_00_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 11148 bytes
SHA-256: 8ccda687afeba0d54c004667041ec7cbc2355cc9cae5fa09c6595317acc7eb0d
font_02_sfnt_off00012c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C67 17180 bytes
SHA-256: e4ab662a01645b8c336b98432762933c678716ef66cba948ee0fe461d6a01528
font_03_sfnt_off00015959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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