Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eab88b7d8978929…

MALICIOUS

PDF

86.7 KB Created: 2021-08-31 14:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 747c2581d62942c925a6a775f31ff32d SHA-1: e97763844910ccecb45be29e903f6c229d35ffef SHA-256: 1eab88b7d897892922852912f2ed977781e153ed9c66a56ddb8bd34a14006462
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://ifa-astrologie.de/userfiles/file/47638019803.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/5sgjkd2ocfk215s5gc52i17mnr/3730480721.pdf
    • https://dbjadow.pl/attachments/file/48690873042.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/25627306324.pdf
    • https://uzunlarpeynir.com/dursun/upload/files/43550750857.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adfd25654a---pexibazi.pdf
    • http://igigeothermal.jp/userfiles/file/nebakanav.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3a74146d0---safejum.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pezevujupesuranug.pdf
    • http://skpizzasubs.com/uploads/files/3590885805.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/simonu.pdf
    • http://budohurtsa.pl/userfiles/file/36998895432.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e16e9ae799---67749704323.pdf
    • http://murphysbeads.com/clients/54316/File/27422910002.pdf
    • http://huabulaw.com/uploadpic/2021-8/file/2021082910100573499.pdf
    • http://royalwedding.jp/images/blog//file/sopoveda.pdf
    • http://tdbakademi.org/userfiles/files/rowasekatavot.pdf
    • http://lev-steklo.ru/userfiles/file/kuzufexugudelulikixulexu.pdf
    • https://vansuloi.com/uploads/userfiles/file/lanewofomar.pdf
    • https://demircanticaret.com/userfiles/file/fesemapawitogo.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b349a06c066---92419797986.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c218869769c---14365043680.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/g6mck1giro25kbv0gcnlo91auf/28502191787.pdf
    • http://unipsyclinic.com/userfiles/file/20210508051038.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f20036e7ba4---14885235197.pdf
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/60308498427.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/4687031180.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=best+cross+breeds+for+families
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eeec.bin
52b45bd3cd6ee1b3293db1a8cdeb735e0e88bf4de463b4923c12f8298dbe4d40
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEC 10728 bytes
font_01_sfnt_off00010799.bin
de15fbc626a3fb3dcb12f5c80520eccc5f5ec18a584f62a730c14b72f78ac8ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 17284 bytes
font_02_sfnt_off00013468.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 16792 bytes