Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fff8ed1b652221…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 15:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 815b30f2104f57bbd36a031ac350d40f SHA-1: f9c106ec71af403c1e248db548f4229732d97395 SHA-256: 04fff8ed1b652221b73b9cb41c1b993a28cef236fb699d315ac9f88adbe6e2c0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not meant for direct user consumption but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e22355db830---joziwegef.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7a8d34b15751a344e3af51d1dc820dd2/samesawizememo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ae65a856e---43153513425.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/36250224888.pdfIn PDF document text
    • http://funperm.ru/content/file/12975119028.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf413b77404---40013876916.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/53ebaed8bd5c170d5e06e57a250c1fb8/fulezirumegezurenipemuliw.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ae587eae3---joworobu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/e2f6a9b630f8c6d99af3d36e79f5c308/disititif.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7e8ec24fa---fibinebinojiwobaxa.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/39968967615.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/jaxiterifivozediviwosef.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/97936302702.pdfIn PDF document text
    • http://parentini.it/userfiles/files/duxujevanoxodewoviso.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608075e54459f---62154417203.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/revusonivanukabu.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/486811482b7214e2c88c83ca18f83b98/27221152308.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/varumig.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/5962865282.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/fefedevibe.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/40610072946.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/kagufurujubodupesufonisi.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/45770642833.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160913b32a9713---3766526953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=bdlaws+gov+bd+pdf+partPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF9 20444 bytes
SHA-256: 73c418217be3a974925d91361a97724a07ade284193dbb10793eaf4cce0e9263
font_01_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10782 10692 bytes
SHA-256: 3aed35ef29f593c8a2e72d53b0dd6e90e58952a36a4bcc4feb44757f5d1b8d28
font_03_sfnt_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_04_sfnt_off000127ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137

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