Malicious PDF — malware analysis report

Static analysis result for SHA-256 b074f374a69d3426…

MALICIOUS

PDF

72.3 KB Created: 2021-06-28 21:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41fc4cd86e4bcb93f52cc783aff62281 SHA-1: 16c92bc104a3ab2fc8b8fba5de68c5f710402e4c SHA-256: b074f374a69d34264aba3f536d97b1616312db52caf86435f61829a0dfc24888
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic of using disposable hosting for a large number of links, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://alianzatours.com/imagenes/file/jalivebegatidafipekizu.pdf
    • http://446888.top/userfiles/file/37116823124.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/68234a5d95db235cec3ff92946f7e851/japixusivozifafijexo.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ddf5b39ec---maderi.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867e8ae84ce---kuxexapemejuwifudivi.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78c5f172f---gususibi.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/nmbhq7qve72s2m7htmvu0h90s2/kesawasobakuxeveji.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b80b337c---24485217174.pdf
    • http://zabradli-znerezu.cz/userfiles/file/98073718235.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/aad159df2b5f36b625c34870a653d05d/60538453838.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609445c76ff74---28768973925.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ae04664db3ca185cfc7385385fbf7a5b/68044286773.pdf
    • https://syntellect.ru/Repository/file/safoxumipurapopo.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607463b874c3d---nevubejexu.pdf
    • http://skipjackpoke.com/ckfinder/userfiles/files/58099567160.pdf
    • http://ahkjt.com/upfile/file/96872037358.pdf
    • http://happypalettebnb.com/CKEdit/upload/files/ganipobinefope.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/6589d6a98c06f216588a0ac2d9f6ee87/89188342085.pdf
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/dobiginuxamozumoka.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4n9kqj0d49va0qlsa6lrr9p5rc/30707990692.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/jakajejobizitixagut.pdf
    • http://banghetretunhien.com/media/ftp/file/mugefo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=low+potassium+and+blood+pressure
    • 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_off0000bb08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB08 16792 bytes
font_01_sfnt_off0000d31a.bin
2e0696dc0f3334fd85652e1fbde0456ab69bc0a17ce8b8cda591ce87a3e2e1ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xD31A 15544 bytes
font_02_sfnt_off0000fb08.bin
558afbf1dde7654f9fb29b15d57df61d406bf8dfbf924d9911c7164093f1f692
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB08 10836 bytes