Malicious PDF — malware analysis report

Static analysis result for SHA-256 3156ee255c966d8f…

MALICIOUS

PDF

95.3 KB Created: 2021-07-20 00:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d11e6fac70a251a401251106afe74a19 SHA-1: aa527fefc166feb0afef4972628236cb8786b51b SHA-256: 3156ee255c966d8f608e2d27288306dc78fdd83392680f7268d748964f160370
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a link farm designed to redirect users to potentially malicious content.

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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/75db83e8ebffd8a28aaf7d950e6f38c5/gezaw.pdf
    • http://flirdining.com/uploads/files/766993036.pdf
    • http://chizclean.ru/files/fck/file/91544780991.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/fih4gvla1o6mgtbskbkgq80e0q/82525307401.pdf
    • http://k12kos.com/ckfinder/userfiles/files/7441474569.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075a9c14a4ee---gujetuvomegareku.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/11f72f05f01f71e32374ff094ff87e56/16439833829.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c106627e47---8481861598.pdf
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/umc8hl3sejtp98uqhduac6j0d4/gigewumizopibuvawu.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608315ef92127---56938902107.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qf9d8rq420rt033ll6a14iipeq/xolebex.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0c886c79ec38a42447354b48b83667f8/69112217300.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/b1b73971c72cdb6bcb3c03337aef77e2/14776751539.pdf
    • http://eska-lift.ru/userfiles/file/fitexexojegi.pdf
    • https://penzionradvanice.cz/res/file/benumorowuzinibi.pdf
    • https://audit-advisers.com/userfiles/file/kesewemimokafijusesijope.pdf
    • http://4998horo.gmmwireless.com/contents/files/44189908004.pdf
    • http://contrast.no/ckfinder/userfiles/files/42825628629.pdf
    • http://automozg.by/upload/editor/files/75577000197.pdf
    • https://cupanghitam.com/contents//files/16789416004.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa06f33ec8---tofakopu.pdf
    • https://landbar.com/upload/files/defagemititakimulofo.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/28cb42d8aa03103cd65025278ab471f7/wuvifosematefuxu.pdf
    • http://www.hydro-tg.pro/upload/file/jejigujaberaxitibalato.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=coulomb%27s+law+physics+classroom+answers
    • 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_off00010bdd.bin
99eb3c1a2c64c1ebb196da123148740d628ceb2de5e8fdb2226b3b577d0dfef0
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 11048 bytes
font_01_sfnt_off0001254f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1254F 16792 bytes
font_02_sfnt_off00013d61.bin
f7e241113d23db3ae96fafdea204971df1c955b17ac6627f6619c191358b1f28
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D61 18784 bytes