Malicious PDF — malware analysis report

Static analysis result for SHA-256 eadc0d8de3d3da70…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 17:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4f7efc125bc99da643f8e47ab96c287 SHA-1: a7d22e893645a0ae2bfa746508be00d1509d210f SHA-256: eadc0d8de3d3da709daa5cedcd131e163d8f507bf3c1ec88fb42a2577c0248db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=how+to+convert+pdf+file+to+txt PDF link annotation
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fed0eec98c---dadip.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3506637d71---1213861664.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/74923910998.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e975d16941---84101539893.pdfIn PDF document text
    • https://heyratacademy.ir/file/litevunotogalivarafolim.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdab57ea19e---37050175445.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a888f27b72a---50928095539.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/lubijagote.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/vamodorefetiwotivojuza.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/7983047188.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/uv7or6fhrp1amvofdjf0ca786e/55623555319.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/17759694878.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/xinoda.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c5a8647a6ecb832c638b4cd8ad7aebcb/82795985140.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/didusumemine.pdfIn PDF document text
    • http://ibb-online.ru/f/file/66969559267.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/6fda76da5c0c1980d5feb82b8b176817/sunukiru.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/5b71e99552099f84b38a982f34a1ded4/83380062887.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c34c87760---lekuxebedoxiji.pdfIn PDF document text
    • https://haidangpc.com/contents/files/bixefapiv.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729d515a9b8---69205572063.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a10141cc0---24760419004.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/wuzaduvaturitulemifopowo.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210602100053.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/44a9a4f9d2e75e1c644dbd5000fb63a3/93188095216.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_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 10528 bytes
SHA-256: 9640fe8246042131be651e04fcf01d1c2554119f9f4f71ecd507cfea8d8a0a7f
font_01_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 17320 bytes
SHA-256: 586276a2494821b6396306a107e8c5a0e43e4caa82c0fe46202f81b2aea558b4
font_02_sfnt_off00013594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13594 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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