Malicious PDF — malware analysis report

Static analysis result for SHA-256 366c32308f1bdda6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 08:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3b943415cc5da05167a323d2efd38c3 SHA-1: 29cee33b0dd06aa4d6ea0f412973dd25598b3231 SHA-256: 366c32308f1bdda679a3cb360506740741a26ffa4a038e8d558f51d229a118be
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to domains associated with link farms or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://akvari-um.ru/userfiles/file/damesat.pdf In PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/78638434219.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/8dba256bae89ddfd6a7607488f624c6a.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/95134431596.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/gakoxomokujagigur.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/4tqk32jup1iql7g35g4l3m9hk9/15103682622.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/24497924922.pdfIn PDF document text
    • http://msiutilities.biz/documents/55308482802.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613211a68c91f---zejapugupa.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d22cacd5e4feaa3c370ffc4116c6950e/6832624884.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16135df6ce0529---rupakiguwurikakamifobisob.pdfIn PDF document text
    • http://centromp.it/userfiles/files/wokufiwaxegodivanadosuru.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/mogezudodatawepuvosivo.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/xogesigonekupolonisezopor.pdfIn PDF document text
    • https://kerryparsonsfoundation.org/media/file/99330721372.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/ragatanekafogaxedarofegem.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/38786970762.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/74938085622.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/43380738629.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/27383461960.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/nonekisuwaripiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sqlite+attach+database+read+onlyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 10944 bytes
SHA-256: aa4efc5a904eb65e627aa8b4b6903d431bcc1e2889d891d4d95f8f2b0def2c01
font_01_sfnt_off0000c8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D0 16608 bytes
SHA-256: 7e86f00e800414ac1e7f767c504c882ef810e3695909342d8d0d971424af3f42
font_02_sfnt_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1