Malicious PDF — malware analysis report

Static analysis result for SHA-256 d28de7a2b31cda7f…

MALICIOUS

PDF

87.6 KB Created: 2021-08-16 00:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a2893923b1cced059731a07b4c868d44 SHA-1: 8ea0afa31410ecfaa6110bcab30c0abc427ebd99 SHA-256: d28de7a2b31cda7f31e0e7a8d7e2491106237c65639caed17b367814d7463dc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and disposable domains, suggesting an intent to redirect users to malicious content. The PDF structure itself is indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://laborke.ru/uplcv?utm_term=marble+run+building+ideas PDF link annotation
    • http://xn--e42bt3l.net/upfile/files/xuzeze.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42f459f27---fulexitupim.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f01f05d4ab7---vifokiliwuxa.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/71264913862.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a926aec8801---jafoji.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/51016270450.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021052313082128.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/37873143199.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/hmo29sqiag547qg567bre3qvpb/34776314986.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a039b414c7c---70368382983.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/70092245711.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8c0e79a4a46ee12f2bd191b90ee5660e/91515856336.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/38233291947.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/71241476174.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/rapaduxutoxavoromokewa.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/6c2ed3de6f0b8d68cd6e98e714fbe403/51953534770.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e899bc7e4---wuzegu.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/92797016599.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/butibofoso.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/jurubixexelizaxozisupuze.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608962a1dd57b---ganigatatumo.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bitiwetijowow.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_off0000f397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 17268 bytes
SHA-256: 566f1bf6c6eff5db0ade70331c7564626d78b1e828183f0e45b9588c1e867909
font_01_sfnt_off0001205b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13872 10440 bytes
SHA-256: 3994555f3c64d89ccc57ac58c042dd59198f3320ed7a9ec1c630baab9f5a2bbd

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