Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca33bebd3998b327…

MALICIOUS

PDF

83.5 KB Created: 2021-06-25 21:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59f8d2563bb719dcfe5b059bb8ad1f20 SHA-1: 98737a65124765dbe0ab083cd57cfe8936f443e3 SHA-256: ca33bebd3998b327e6067b69f5924076e7e808449383480e1c40c3b2d4c7cf48
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and a high ML score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://cafesca.org/ckfinder/userfiles/files/40925348794.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/s0jtd0okukfmbu4cjeaua25okd/gosujodule.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c986798162---71072193162.pdf
    • http://alpha-cp.com/userfiles/file/43157701129.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/253b6f3a313cda526e4a0bcd405046df/xemegapivokikeluk.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609f274e9ba2c---65662592982.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/sobuxapenakopexebogapit.pdf
    • http://cortabellanews.com/userimages/jibavazusagafove.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/j8e9mfd3hvqh89i1vnfr48bs4t/kukosikizisaxenewo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/016821d574bf893ed7c5366e4b4f52da/94625746896.pdf
    • http://pechati-piter.ru/userfiles/file/tunoda.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/1344269f2a05df71af3c41dfd45436e6/75238292301.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/22c5e277dac2fbbf428621ad37139bfd/tosizalevobavi.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/d918134dcc22272d02c4c75c9c150cc4/bofizisivukaxinovod.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160802e7abf239---boruxinazanor.pdf
    • https://unique-u.biz/images/uploads/file/kujopoxivagunaxo.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c29b2069f84621c57b0a9fc64851adde/gufugupujizefizarudezizi.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95b36b3e7b---50721179657.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/932to72icuf6rftisg23nbihl6/milupewuj.pdf
    • http://bjhtdszdh.com/v15/Upload/file/202151315918839.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c04db74e6---zibutajijozigiguvemaz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=no+vaginal+discharge+during+pregnancy
    • 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_off0000e4e4.bin
811c1214a253d62f0775e67e5f61af5b37f055ffab6d08c55d2aebf659a0f65c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 10952 bytes
font_01_sfnt_off0000fe09.bin
1a02e2cdaf256d1e6502447a3e9dbe49fdfae9dfae893bd98910c6f558f7d807
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE09 16476 bytes
font_02_sfnt_off000128cc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 16792 bytes