Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6ee74d284cd390…

MALICIOUS

PDF

90.0 KB Created: 2021-09-06 14:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e416c4a9d7ff78b05bbb317869ce72c7 SHA-1: b1dab6924e0a90c6730ff8ddfd5e5da35eaee96a SHA-256: 3c6ee74d284cd390ac35c3f66bc969cd8cf584d7e2b46edeeda8a7d79b040ff7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of a link farm on compromised infrastructure suggests a phishing or redirection scheme. The primary attack pattern involves luring users to click on these links, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://jagatjyotischool.org/jagatjyotischool/userfiles/file/15030193199.pdf In PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/36ffe616356144baa6b563f484bf6687/4555771858.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986d1f734bf---72123228747.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/3249021882.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/51754178080.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/161138e888d90b---nuvaj.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16113111bc1538---likerijerir.pdfIn PDF document text
    • http://abroadster.com/files/37742982067.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3cc3c56acd0ec16623d3dc6691abd31b/zixilinoruludos.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/wipusoxovirinefajigazeri.pdfIn PDF document text
    • http://reichspfarrer.sk/file/84178362745.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9500c28db---labukulavize.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/pirofimuwofute.pdfIn PDF document text
    • http://dges.in/userfiles/file/13246440981.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/53f79d67c2ff814bdd287ca32d3b1a93/95978516411.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/vaken.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/d2emo2nvg0i95hcrsjqqmfhis8/jivixesafojumodegoj.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/461c58a39937d7f5983ee0e77f1af602/53062490333.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/xuzuresuxerazisazowasivi.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/teregetosepa.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/46493303712.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f39ce44bb---boxozesiziwezirafipig.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608248b69f5d4---wubexuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=behringer+x32+digital+mixer+manual+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB04 21248 bytes
SHA-256: c33d9b7a4bfd99f479d77907ed19b668cde51b6372db4fa86b6494644943eb5a
font_01_sfnt_off00011275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11275 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A86 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_03_sfnt_off00014016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14016 11204 bytes
SHA-256: 69b1997e996e216942f83c78eda739afb56511ef6d2bd09b93f784f450464f8e

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