Malicious PDF — malware analysis report

Static analysis result for SHA-256 11df889a7df6f742…

MALICIOUS

PDF

99.3 KB Created: 2021-06-26 05:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0cebd0f8ec77877c450d7556fa0977d SHA-1: 2e7d6d7b7aa98a611e3eb81c9d065055cdf761c6 SHA-256: 11df889a7df6f7429dcf71a8793e9e4ea780e2c6057443532bde0b7886aa51a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on potentially compromised or disposable domains. The presence of numerous links and the ML detection strongly suggest an intent to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://p-itos.net/admin/userfile/image/file/29601865013.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/12274828920.pdf
    • http://sisparts.pl/zdjecia/fck/file/43419421120.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160821b69d1b67---xidofofewumuva.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/503653d35001e22f4fedfe1ce0702863/19660685609.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750e11c78a4---zizuwolarufologe.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/e0221df313135f46f9e05812b30f85c9/96675712312.pdf
    • http://www.tomasjelinek.com/img/pub/file/xefisevenifutixavu.pdf
    • http://trans-serwis.com/userfiles/file/19460496131.pdf
    • http://mkngsp.ru/upload/files/63514970446.pdf
    • https://aduanaldelvalle.com/userfiles/file/vabipeg.pdf
    • http://ibb-online.ru/f/file/48746765244.pdf
    • http://moon-villa123.com/CKEdit/upload/files/62212003966.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda9c1d399---7499982011.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6661902a6abacd9935ab8cfd55b43e24/purowokixa.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/ia3st4o1era20k0niqbnm91qlb/33628028965.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/165852109960cbefa8d5fd3.pdf
    • http://liburnia.pl/userfiles/file/toluxisuvixu.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/8980846922.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/96cd2562a2ff2ff38183164e686e984b/16279542130.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/44609bfc7e8aef224d50a4eb5587a40f/53041096923.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/8a6j1ps3qfj2kfem3o9d02t97c/80621985906.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ae672e1bcfa---7435896904.pdf
    • http://goldnumber.info/userfiles/file/jurodigijekukewezaveranog.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf836e558---83001717870.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ahmedabad+diocese+network
    • 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_off0001208b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1208B 16792 bytes
font_01_sfnt_off000138a2.bin
b5e0a8bb841e436fa7b500e8016aef82b8f865514b57900638e8edeba4c5fe44
pdf-font-stream PDF embedded font (sfnt) at offset 0x138A2 10888 bytes
font_02_sfnt_off000151b4.bin
fb683e973f7bb2b3f57f2d6424dd0bdafff3a9f20c379b83e53839824743304c
pdf-font-stream PDF embedded font (sfnt) at offset 0x151B4 17756 bytes