Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4afdc658d3bb14…

MALICIOUS

PDF

85.1 KB Created: 2021-06-26 22:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f64fef885186866a2a5feab1985f4df9 SHA-1: 41c51505f4e4ae0811b91b6ed2c8fb5b7af6e0e6 SHA-256: 6d4afdc658d3bb14655b18f2839285273eb1fc0e66ce3432a6dab88ac566fad4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple links pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used to obscure the final malicious destination. The PDF structure and embedded links suggest it is designed to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/669720e2ad033191c6257318ad28cee9/57014153090.pdf
    • http://skiflogistics.ru/userfiles/file/22858986804.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078f835925cc---xaletezuvobolulusoralu.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/uvetc8nhuheedco62i188l0dp1/puvisidomimun.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b9f6ee2830888839c58c2282f31d2bfd/duxigivuxexufutukuxak.pdf
    • http://chocoenglish.com/_UploadFile/Images/file/bukobewadub.pdf
    • http://aryajob.com/user_upload/file/badatabipozedabetigo.pdf
    • http://3dtechgroup.com/uploads/image/files/jenezapabixitenow.pdf
    • https://rumahbaruku.com/contents//files/52439592334.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7cc418a6e5a6347e046167dbea9e4463/sigebogevuxumox.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2cf80f87e87a07778d91b5bdad6fab7b/97078501744.pdf
    • http://wuxihemei.com/ckfinder/userfiles/files/20210626_022918.pdf
    • http://abpaluso.com/upload/file/vuduwofiwuzaxigazeja.pdf
    • http://ahxxzx.com/userfiles/202104/file/dakimevenafuxakugufetoza.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608799e59991f---42983554411.pdf
    • http://richmediahouse.com/admin/uploads/file/magev.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e10bb72bd---tugipez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=electronics+circuits+and+devices+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_off0000eab3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB3 16792 bytes
font_01_sfnt_off000102c5.bin
2e0f22f14d05e605278f9d449cd019689a198ac4a67bf2f59894b79967c0d4cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C5 16968 bytes
font_02_sfnt_off00012ea9.bin
8d4b990cd4fae013602a5670c082c9e2672ea3a386ba8e855fe90c8240c5c844
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA9 10764 bytes