Malicious PDF — malware analysis report

Static analysis result for SHA-256 b791ae38b403ee28…

MALICIOUS

PDF

87.9 KB Created: 2021-07-06 13:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3433bfaef1e92c0b37ac63efe152cea1 SHA-1: c498d9ffa374f78b42d0cd3c8d17c7d54e787bb9 SHA-256: b791ae38b403ee2849075698499212f078f808b36374500e7dc6e317c7da3a75
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hpworld.hu/data/pic/Image/file/92845872321.pdf
    • http://sk-massimo.com/js/upload/files/tagetarikikebajo.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/6f59505b9ec38603298359525fe6d51f/merazasugafeguwoxeju.pdf
    • http://capmar.eu/userfiles/file/76328465314.pdf
    • http://hondasushi.com/uploads/files/kanegosiwupoxakiwezulur.pdf
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/0afe28c96f978e3eee967cb7ae16bd64/36596679340.pdf
    • http://omgmediatank.com/userfiles/files/nojogemajawaza.pdf
    • http://espacioschillout.es/images/admin/file/21839582204.pdf
    • http://avision-italia.com/userfiles/files/towujet.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/43969561668.pdf
    • https://boucherienabli.com/uploads/FCK_files/file/55675062982.pdf
    • http://robalton.es/Albums/images/file///mapijuxujokivititojiwufim.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6d217d4d7ed68a9b01101ccbd2f5d18f/buxapisesone.pdf
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/n7ovmg71f1ipavo609cd8vijs4/xewifozuxadoxagutenem.pdf
    • https://lanhcongnghiepthinhphat.com/upload/files/37191269311.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/jalelilejetuborizusina.pdf
    • http://ctkupavna.ru/upload/file/50634190079.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ql6urmkuf6a7jkg70290irtupg/vegazibiguxujirure.pdf
    • http://gillsandgeckos.com/userfiles/file/31249181845.pdf
    • https://lawyerupsmart.com/tempimg/file/lujijatosetonebuzusemar.pdf
    • http://theonejsc.com/userfiles/file/11923259264.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ba7dacc3---woredarut.pdf
    • http://nature-revive.org/files/file/derapawegigodonubobik.pdf
    • http://roocenter.ru/upload/file/wonepodadajikalepokid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=proof+of+aliens+on+earth
    • 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_off0000f782.bin
4bb735fc6db6d15b9c3295805f7567920cdafa5449b79d91e8548391b596a2ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 17116 bytes
font_01_sfnt_off00012394.bin
c456077852ad7b0e2ed4b09f2a068c7da80f6b0f88122074191216b7c40c8b0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 10312 bytes
font_02_sfnt_off00013abd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABD 16792 bytes