Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a65793eaad564e…

MALICIOUS

PDF

89.4 KB Created: 2021-07-05 00:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c4762248cadf7f4928f27235c31e2f7 SHA-1: b38a0e827176b9a7f03947b7bb25ef2d4a6bce79 SHA-256: 42a65793eaad564e105c1f7af27b5c0997b90933cd6e92a7a3e073a0441ae92d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs and link farms pointing to various domains, some of which appear to be compromised WordPress upload directories. The primary purpose seems to be redirecting users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=samsung+galaxy+ace+gt+s5830+user+manual
    • http://zuche0551.com/upload/file/zizopararexibada.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/380f6f0ed80214a0613cd0ebb7988aa7/rasetitikowugukozisobogis.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/f92321e33eb90cf013b36dbca956d316/93980680057.pdf
    • https://theelementrama9.com/userfiles/files/4256433442.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc1e0df8b6---nuxuwepejifekeganutanil.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1b29c0ae3596fa2fde6219951b531dea/28109635268.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/nivka6d6s2lt2qcgp7v1f1vv84/murutapuvekijiwe.pdf
    • https://nnkcreations.com/userfiles/file/21459182578.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/6dc62ecc98839105927b1266aa2f099c/tuwugu.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cv7bketjqa2t6tp06g1tvden01/vatupezufasebo.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a816b30ff1f---58180173223.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/sodisupunozusifazejijuzor.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/45b296228dea40dc132e0edf67aec5c0/papibinavikenutitonaneb.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7186791c50a86550a3893ffcd53b9b76/58205336933.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762f57944fd---fipadulubarubuvap.pdf
    • https://delphin-restaurant.com/ckfinder/upload/files/27712854323.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/21ff148b556274936aaf545e098bc8bf/28900362317.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c7805884646---1526070637.pdf
    • https://dcimx.com/files/29007716527.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e1e7d70a---ziwepizatunum.pdf
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/dhll0d6rt2gm1c72ukpmplarfl/47660455842.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c614f6e7b9f---resojonuxanar.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2f3bd0d118b37b3f2bf3e0618c26aed1/82419222435.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/cmv345hpvff5uqv5jt3f4ul7gc/84135674412.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3f61faf6---palivuwexisip.pdf
    • 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_off0000f64f.bin
5af880f36e9bb8a19cb6d93ad5867a4e2f1f8ae03ee393406f4ee25f265b5892
pdf-font-stream PDF embedded font (sfnt) at offset 0xF64F 11388 bytes
font_01_sfnt_off00011145.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 16792 bytes
font_02_sfnt_off00012957.bin
4b8feb330220bb1ecea691b13f19f735d2f94eadb6905ed3e0535a5cf1c36a7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 18140 bytes