Malicious PDF — malware analysis report

Static analysis result for SHA-256 0160c4e434d685fe…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 23:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b2210fa38cd239159e9f206df0ea3898 SHA-1: 4d5c01408253f0d7b055cf7c7bec81fc4d5c3ad6 SHA-256: 0160c4e434d685fe4577bedcb97b004d90fd63f8724783a8cfda3e6389fe43cb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to compromised WordPress sites and disposable domains, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/5a0tu50sfvoealrg0oeaf3tdf7/jezevewif.pdf In PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/lrigcvs3nvob7tf96pe0rpj92v/70805915350.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/kufudikasadiremifidafotod.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9frj3ihp88d0k23dcms37bmehm/46113722286.pdfIn PDF document text
    • http://mp-journal.com/media/file/baxadexeze.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e77c5fdfa---86320226600.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/efc80f85ba492db6848dcecd60376bd4/bawevaz.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/86169209383.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f21f425e7a2d9ab248038ec584c29e87/47301980933.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/61063668852.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/zuxogibofitobokufari.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/soboradifodefudaruzutip.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qh09t927kp7i7d8qidj9vnsgm8/64015930154.pdfIn PDF document text
    • http://islandpointfl.com/userimages/94429914261.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608620ffef482---wokasamunogixetat.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/xivugapizetinaxesi.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce1e1dd6be---saxuwoposenoremevobofapok.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/lofuvaxu.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/96213805385.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/908d8faaa0684f0512f8954e68d18ae1/42929597722.pdfIn PDF document text
    • http://enricobarraco.com/files/52086667811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=polite+words+list+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB99 10312 bytes
SHA-256: ed58a0a19a00484c447b1ac15493605347881b91a78a0da0eaa8479ab5d10d63
font_01_sfnt_off0000d302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD302 16312 bytes
SHA-256: aef9eef477b5dd8d9c1f16d5a82059d7b7030ff2d2e70694b4d63a0bf392e0ce
font_02_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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