Malicious PDF — malware analysis report

Static analysis result for SHA-256 39266ea5e056b668…

MALICIOUS

PDF

97.0 KB Created: 2021-06-30 22:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac5c450816929993c10a85d5ce8dbe57 SHA-1: 9408123d1d14a51d2d570b9a157f52c85f66b7d3 SHA-256: 39266ea5e056b66874eb8d912146a6972c419d6643f1d4acfeef834545f27431
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, possibly using JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/knvsvqi0t4irginerqidi3skt6/22153089634.pdf
    • http://eros-arena.de/eros/userfiles/file/koxudizuku.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a5b59fca0---85504761319.pdf
    • https://safrano.pl/userfiles/file/72782726249.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/179c6f91adcadac06e0f71d72a1917fc/68754986888.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afc58f0b1a1---lenokusetisigupon.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd703b727b---jesavebixunix.pdf
    • http://goldenpoolandsauna.com/user_img/files/zibuse.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f83c31e737---vemananajaxarogoleji.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/ba24b5c0f50f6737102e3aca02da059b/kowegodujowerari.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/074a99d1dfc892d1432df18f9d67ed53/zufupikazevomokamawil.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f3ed42f75353f11ba65f5ad1426aea46/37098778318.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c40bd4e6523---84712915539.pdf
    • https://asi-filter.pl/files/file/86791204567.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/28220397556.pdf
    • http://varanini.pl/userfiles/file/vomelagelitime.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/795ff8de8bbf5d07c53c0ebaf482b302/mubeponuwodop.pdf
    • http://jngf.cn/files/file/xasapogi.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e735f51bac92130365a73f6f14871124/kirifugalopotigoral.pdf
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/ucdlnij8ql8dg09rta6qu7mcl3/46808325020.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/e2fab4a440d063d429838f0c845c295a/rojiwapanezeg.pdf
    • http://umrllc.com/userfiles/files/luxejobalexeda.pdf
    • http://budohurtsa.pl/userfiles/file/gebupefajisugexugo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=excel+budget+forecast+template
    • 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_off00011757.bin
3d9b99909c6bb06efb0629db2029bee3bb1baf9f38c0e77a3ec0ec6bd137de51
pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 17528 bytes
font_01_sfnt_off00014566.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14566 16792 bytes
font_02_sfnt_off00015d7d.bin
b0f052499d888fb022676965100d27cb419db82346986ecc3615024d9c4e22e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7D 11092 bytes