Malicious PDF — malware analysis report

Static analysis result for SHA-256 19635247ebbf8285…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 03:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 581367be259f661e8b87ddb85693a1a2 SHA-1: 1ccb06fd885585d8ed727bf10fe333e70879d23d SHA-256: 19635247ebbf8285b83e32144b9d09bdf7dfb794ac4ce71da90a34bcf1b5cac7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. This suggests a link farm designed to distribute malicious content or lead users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160916a3ec672f---sisojimavuvisojakopu.pdf In PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e3f298811---bojakojonujejalozifabideg.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/86737380735.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/d76k5crap00cp2pjcohuna8pkb/kujituzeloxu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a41cf16b957---67135842070.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/f8d640b1b04a34aa42433b48f52955f6/bimagigixasarelepivinuz.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/872a6225d7a98ce0e0d1f3abaaeb8eee/vanurupexamelebumo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/20e5d5b9428eb46ba417a7ec2bb315a0/lusirikikewibepowirutis.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/11395342426.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210618_DEFE72C87335F125.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe2eb01706---50994859017.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074c73e94675---xorenumajogaf.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/rutukuvuzalijaw.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/1t64ap6lkrfnrsv76ifgl5frk3/jiwusolidorosopowero.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/45866323561.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/lavuzowejogekuzupewe.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/54632e9a36e47b533de4542ca58b07f7/xewemoxugijuzul.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160949486e470b---34036396519.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/29344027863.pdfIn PDF document text
    • http://northcity.rs/slike/files/wubopuxumukokep.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/oefgq0f19tnkk32gf5pfb0pfv1/10178197451.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/0a98916ad2de13f331a0fb758c38e91f/43759823943.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/63dd78b7050610b9c513a07123e576ec/vomalulubedokop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=policy+sign+off+sheet+templatePDF 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_off0000efc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC1 10944 bytes
SHA-256: f438427b60a5faf37cb2160a5b61ede3bbad6fa5f2b93f05d05742b59868d483
font_01_sfnt_off00010901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12113 16512 bytes
SHA-256: 8a79f890a79fa68a8996016c18fed6aeb6a907b7b878bb82c82213c096450e5b

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