Malicious PDF — malware analysis report

Static analysis result for SHA-256 af37de49f698c168…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 20:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ce314e788dc5b4e9c72c8c6d11f310a SHA-1: 99274a21090534622d3b55d960702155b2b2b241 SHA-256: af37de49f698c1684702970aeac4bad60e8d0347e048eb345df71126be8e72e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/99f72c434919c0776382a0766204854d/74190798092.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21e5b314a0---bumune.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/82b2f2c36238f41209d7f65cef8bfcdf/30612972884.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40d256baa5---97467239079.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160713efdeb904---kozavuxejisegadid.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765eabc2caa---23041190042.pdf
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/faf25174c9b840ff3966f325bbcb255d/51911408289.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/0c0242f40275f3a5e5a069ecbe82238f/lerovudeluduxizumuvopopi.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ho1n3g293ht65lncfb1chphs7m/sobajidinekezisipekuna.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/21fbdb9577351e90a7d8d6edb5193f03/51326602194.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/gejibokix.pdf
    • http://elma1.ru/!upload/files/13368959493.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f380c2aac---rexumoviwepetu.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d8ba855b0---dalebibexajamiv.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ffb47c16b---71790378617.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b41dbb6158e---38496009349.pdf
    • https://congchunghadong.com/uploads/files/88361514218.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/9r01rguidt0ohmon266ft0vne9/xezizabogipuvepoxikegipen.pdf
    • https://cottonweb.net/userfiles/file/sorezo.pdf
    • http://ibtaker.ps/userfiles/file/wepevoraxobuvemose.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210610_D6D96410F393CD6A.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b86200fe82046807cd5cd1bd8bcce976/39916033590.pdf
    • https://akproauto.com/nbloom/fckuploads/file/beveligagekelewulu.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/92a170f2fe681d65f44ef0e0fd9f9a9d/timatesiwaxivigovowejuto.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0b9771e16---90227518368.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/o6melcerfepjkf2d7g841kjdtv/72105330254.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bioprocess+engineering+basic+concepts+solution+manual+free+download
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/348cdcc5736364a198835bc673509f02/jewupobevenadi.pdf
    • 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_off0000ea9b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9B 16792 bytes
font_01_sfnt_off000102b2.bin
097138e67cab9670fb542bfc098a3b45992e2262be8a4c50115c24b2f35f6bdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 11340 bytes
font_02_sfnt_off00011d0c.bin
197b0069c878e7d00e34fcbd66667d85bef55a41dc922241bf31bb62670710c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0C 16488 bytes