Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1681b8d608a5bf9…

MALICIOUS

PDF

68.6 KB Created: 2021-06-21 07:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac43eac748987e6e66237e40ba2f7c86 SHA-1: 8bee0847cbc6b5d850fe4a0e3d103eef94fd18c6 SHA-256: f1681b8d608a5bf918dc234a2d7cf9bfcfd3aba1dddc65472d36b0c891cfef2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic findings and embedded URLs are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c594f0c75c6---vapunogemesofedimoxetada.pdf
    • https://ludifrance.fr/userfiles/file/xajatunip.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5e298dc80db9220457e612aa12306dfd/sizuwowakifu.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a01fe9719---91027391791.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f784e1db---fanunez.pdf
    • https://synersys.fr/contenu/file/mulipotitixufix.pdf
    • http://shinies.ru/img/lib/file/gijuvakinomevakuloxa.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160907e0364358---zegoriraxodonagamoj.pdf
    • http://abacusnancy.com/userfiles/file/3446532020.pdf
    • https://termocasasrl.com/file/96324428736.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/sfgi2vkosncfgnoe3sgmn27sog/lejitelotuzapexiwogep.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2611afdc3034eda7a46660c84dd26f3b/nagetewinotedavimadiw.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/3e6a0fe721e7875bc200866bffca14ba/16675166542.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5968ae2380579c7a3f75fc15fb7f0274/watedazeg.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/s9nt7hsf2grs0qrqcq0a85bs4v/kirev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=watch+the+prisoner+of+azkaban
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bede.bin
5d8f6d6869740f90e3033991ea1ccdbebe0930780db015020e92c3a4fdab32da		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDE 5128 bytes
font_01_sfnt_off0000d049.bin
fcf402b0acd795a2ac441b744cff92f8534bc8c82c9b289e1222ab7b99447f1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 11028 bytes
font_02_sfnt_off0000f5c9.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C9 4324 bytes

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