Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8c1fd3c63543dc…

MALICIOUS

PDF

87.7 KB Created: 2021-07-07 05:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a43be744f83d3058dcc30fa01382336 SHA-1: 36fd25f9bacd649522a10619edd5714f8a1b58e4 SHA-256: 9b8c1fd3c63543dc850da7bdf6d4c6ac9b4b38e0d98089760e712c75a9589a0b
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating it functions as a link farm to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple compromised CMS upload links reinforces the nature of this document as a distribution point.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e1c501b590b889404eeb363990744833/3140820838.pdf
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/33947709917.pdf
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde4e24ae5---60766811597.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16084c8e7320b3---laruxitemejojalowotevife.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/kamv3ehrmsh2kvfum1a68auvp1/29685740190.pdf
    • https://ludifrance.fr/userfiles/file/75385125612.pdf
    • http://petrduchek.com/files/12192682106.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/66e267195558661857fe0be438d4ee73/92608733161.pdf
    • http://ateliergermain.net/sites/default/files/file/9914496848.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba058123ef8---vovijilerakakezusesopixo.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/88aab7ff3b95630f1614ed260a8e6d80/mudifogetukal.pdf
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/30893771147.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3168bdbe50---supesu.pdf
    • https://atpl.aero/ckfinder/userfiles/files/92697822175.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7760d99e---kopadu.pdf
    • http://bulmarconsult.com/files/16379429018.pdf
    • http://www.asslar.de/downloads/51971957456.pdf
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/58595540992.pdf
    • http://diegogenna.it/userfiles/files/19596735375.pdf
    • https://transport-vehicules.fr/userfiles/file/14043207982.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=in+text+citation+apa+title+of+article
    • 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_off0000f46d.bin
75be0809c072e3c5901543e96c06965de5fba49bbc8bbcf14f914739d4986c7f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 17644 bytes
font_01_sfnt_off0001225d.bin
9b9b878cb5f2893691097e9c87a32e902535150beccc4cbca8a05865082a3454
pdf-font-stream PDF embedded font (sfnt) at offset 0x1225D 10356 bytes
font_02_sfnt_off000139e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139E2 16792 bytes