Malicious PDF — malware analysis report

Static analysis result for SHA-256 feee40d89e31b0c2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 15:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b8399573c75a85090e050eeaebf958a8 SHA-1: 749502ee2aed8fa2ce11cfdfbeb60b2f618a2bfe SHA-256: feee40d89e31b0c2a28fbe0aa8253c453cf3db40cf346cd02d7b79ed5f0743c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the presence of numerous URLs, many hosted on potentially compromised or disposable domains, indicates a phishing or redirection attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://hurtowniagrafit.pl/userfiles/file/bevotowizokovowosixati.pdf In PDF document text
    • http://tainghe.vn/userfiles/file/gefizofogarasafad.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/48565981017.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/fejepivigusus.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/37588982353.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/jajoxiweve.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/40474236012.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/gikekuvugijosudonosimumu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/buvatesezomobisoripumiwu.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/03/file/20210903_073015_159.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b6a6ff1470e5d9eaad7c15f0fbfbb593/bagesenorapidekubagarega.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/mivobinatulenulawemaziro.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/tazawikekefodipemez.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ec6377fc3f88f12e6a112e323aefceb5/23515776520.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/libagibusaxomobebavopoku.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4e4581a8---39569007362.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/64912787217.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/wogubatim.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd14439d1e---59546646803.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/55697151655.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/jebanomi.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/tafukam.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/34140769958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=botw+wii+u+romPDF 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_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 9896 bytes
SHA-256: f91cd040526d19f9a0656cd84f88cc2499587a1df7108f83cad544f40ff525e0
font_01_sfnt_off0000dd5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5D 22552 bytes
SHA-256: 5a589e7995713b58a08ba2e192137b204f2a47d7370e0d5a102aad452e6ae8b5
font_02_sfnt_off00011910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11910 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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