Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c339be06282c63…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 22:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: abe04c7ae52af49b8f31bab6dc78cdd8 SHA-1: c72d7a336bbc4995b995bdac82f6db6ec5f8eab5 SHA-256: b8c339be06282c6316731b7ed4c33de00f3d5a0ab899fa31ba96600ec959701c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://dajuicebarus.com/uploads/files/zugikifenej.pdf
    • https://drsubhashawale.com/ckfinder/userfiles/files/94816681054.pdf
    • https://sbufficio.it/file/31895586359.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/1jvalb451thf9n2p67u9cbnr67/30901750497.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4d8cb4ff9---13073204513.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf85f2f744---guxivupinigo.pdf
    • http://planbmedia.hufiles/jatufujo.pdf
    • http://xiaohecollege.com/d/files/93919004307.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/589582cb6f7f0aa957202857908c67f7/kunogovapisopufu.pdf
    • https://begili.com/uploads/image/files/bokuxivazuzarikatum.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f296467f87---72611480404.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bap22dhdadltshmlfhmn85muq0/jinifebabu.pdf
    • http://veronikavilla.hu/userfiles/file/gupemegubo.pdf
    • http://infinity-pro.ru/userfiles/file/47066170331.pdf
    • http://kajsanordstrom.com/userfiles/files/nepekuniwux.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9f95ac98e2bee8725d31a4b3983fc4b1/fuzizutoxijinuxufonusi.pdf
    • https://ludifrance.fr/userfiles/file/regujeme.pdf
    • https://topjobsnepal.com/ckfinder/userfiles/files/81098275663.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc39ec9920---xuduxegarudonoven.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607686327a944---23013151865.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076949da301d---74887281462.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/rdmh3r4gijcm45a5nltpom49nm/69431814605.pdf
    • http://finproekt-msk.ru/userfiles/file/gexabavotikozozutome.pdf
    • http://agnieszkapawlik.com/userfiles/file/1544937166.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=windows+embedded+compact+7
    • 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_off0000f0e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E4 16792 bytes
font_01_sfnt_off000108fb.bin
c2d63e2f75b7f82470d15a80d428102727533f0f5003cc33098a5509d0ccf4a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x108FB 10796 bytes
font_02_sfnt_off000121c0.bin
5d98e7bef9e574e1ac52f11ca2ba44932c3b796caf81888f600116f52fa51003
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 17752 bytes