Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ac501009efeb31…

MALICIOUS

PDF

86.3 KB Created: 2021-07-05 16:12:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 153198fb627f5a3ee15701406e0ac0c2 SHA-1: c1c71d7a10e8bbd51e69445ff88039fbd6255582 SHA-256: f1ac501009efeb315ba5a0018a6e54e29b824cb32bb6a7662f34329c37d5f1cb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues about its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://anthonygillant.com/userfiles/file/komilulibiwajakixaz.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c0f8eac9---81830921802.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a83d868f09c---pemanarikapa.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86c72ea8db---fazazix.pdf
    • http://hasyo.net/files/file/situgasejifupezenawide.pdf
    • http://yakutiaprime.ru/SITE/files/editor/file/borum.pdf
    • http://saharun.org/uploads/ckfinder/userfiles/files/zisofamexesavovikef.pdf
    • http://siembra.me/uploads/files/68493203462.pdf
    • https://digireg.org/upload/79014432545.pdf
    • http://fiumaradelsossio.it/userfiles/files/revaborafiba.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3d1c26369de45562622f61b591faa6d5/59188316914.pdf
    • http://unipsyclinic.com/userfiles/file/20210511094547.pdf
    • http://trekkingsapatours.com/upload/files/fuxigomemurabefagaza.pdf
    • http://tunglamgarden.com/images/fck/file/76903003370.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082b7b49434a---27091379448.pdf
    • http://canvangdientu.com/images/file/gufirunumimuwumebumuxix.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7619578677---vuriwonevofasejipon.pdf
    • http://www.chatanakonci.cz/userfiles/file/jekugavujujumonapos.pdf
    • http://drairtools.com/ckfinder/userfiles/files/80588661134.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3f3d7863ae5f50a38de6e4bb5a5ac4fa/59046009829.pdf
    • https://egokituz.eus/files/galeria/files/rujavogaragup.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=examples+of+points+in+limine
    • 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_off0000f088.bin
64d88eb1bd72b6fe11e2379bef253e5a85d3a83b60c5365d2f40009d2e0ddc8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF088 16804 bytes
font_01_sfnt_off00011c3a.bin
3e88959a6ad16947480ceaa4417c456eb7e13821bf7c6e69ac687f2f5dbf1e01
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3A 10504 bytes
font_02_sfnt_off0001341f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 16792 bytes