Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5ac93b103219cf…

MALICIOUS

PDF

96.1 KB Created: 2021-07-08 06:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8616cae4f572727d7da915ebf6cfce5a SHA-1: d0e569412063060ff30a1792f170b0b8b5bdac07 SHA-256: 7d5ac93b103219cf79d117f186bd5ca2f566bae70fc0061ed305a2fd2df647e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=endnote+class+not+registered PDF link annotation
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae038b7bdbd---xesijorewerabibuso.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160734554ce8cf---pemikaxebidofo.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/jadewunutorod.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924b8197512---jusigirigu.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/4048910732.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/rebunurizewatofudesevol.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/6369128137.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3h6q9ht3l5fl6426q0hv0388n6/razolutilururepus.pdfIn PDF document text
    • http://righetti1970.com/clients/872956/File/72741848039.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5bf15364d8701615b2bb6f5844078614/wojusekotobexumorojebano.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/177677c05c0ccf962ee1c67c058ce2fb/32360834193.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cf0e5217e---poxapobaniwatipokekat.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/milemuropidas.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/xefubilowerovarekanu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86f868f16b---76402825458.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/41737375455.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e2441fca250ff65c0e7ecc373cc9c9d2/tadegexedikodoji.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/48287012547.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127657a177---16985175659.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/p7hisp1cst653cof1lgujukbeh/66117328373.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/zavivenawon.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/85fjb9rjvsvrj796pi5gu64do4/46160663973.pdfIn PDF document text
    • https://123natura.com/stockages/files/98770575306.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2E 10528 bytes
SHA-256: 1d6c119fe04837e4527369ae57550fa5f9908426fffbc92fac2dde925d6ddeef
font_02_sfnt_off00014502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14502 17608 bytes
SHA-256: dc084fb40dc60278772bf24ceab5665e2da3512e9d7aa679370e62a24b3d9d7e

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