Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3de80493f7ed976…

MALICIOUS

PDF

84.1 KB Created: 2021-07-17 03:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 730679da121ff02bbbf3ca0b2fd6b799 SHA-1: 80b36f1b34c5bf59b7023bdc9c6ce5a78251e60d SHA-256: d3de80493f7ed97617c58e0059cbcc712847abe694eb8468769b17b3780777a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, directing users to various compromised WordPress sites hosting further PDF documents, likely as part of a phishing or malware distribution campaign. No scripts were extracted, but the structure suggests it's intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/e52d8874ca1181d11ccb6030a89150b2/bitetegopovisebi.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6895918c4---91565121604.pdf
    • http://macautemple.com/userfiles/file/gapokidoneda.pdf
    • http://dermalab.pl/userfiles/file/supasufesuxog.pdf
    • http://brianhaymore.com/images/e/file/21925126012.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d49ba1a9b3fa2dc89ec977a2f4395e93/58611462080.pdf
    • http://tebsc.com/clients/84181/File/baguzasotuxopot.pdf
    • https://mediaget.ru/userfiles/files/kabuzugegupugagijuki.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af74ced0391---55805810032.pdf
    • http://orhs76reunion.com/clients/30721/File/18907533383.pdf
    • http://vom-ragnaroek.de/uploads/file/90006825782.pdf
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/kenulukagebok.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608331b5aca41---21049302359.pdf
    • http://au-zlato.sk/upload/files/lumuduxufugureraxapisaw.pdf
    • http://bilafafafa.com/shopadmin/upload/files/rafow.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/3q2c9oommsgbp7nchkq07eri5l/pekawozanomiruxas.pdf
    • http://melinterior.ru/userfiles/files/34984402378.pdf
    • https://a2designbg.com/userfiles/file/8039973568.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c136bb1de4---81455876289.pdf
    • http://apartamentosalbatros.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863c31cc059---suzibitujuvon.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e8a5eed23---sojatafelugoxuzumesi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=urinary+incontinence+and+uti
    • 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_off0000e9bd.bin
6a1cb25e594512bd5d16abb95947355b69d9a117f06821872aa90c24018d49e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 10372 bytes
font_01_sfnt_off00010154.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 16792 bytes
font_02_sfnt_off00011966.bin
ca4d8637e72826d6361898f2660b384c017e04ae9bdefa47837b927c6fd2d758
pdf-font-stream PDF embedded font (sfnt) at offset 0x11966 16248 bytes