Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef30d41e29c86cd…

MALICIOUS

PDF

66.8 KB Created: 2021-05-24 18:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76525e25bf276f28b904ac1dbb5dab3d SHA-1: ab4ff7cb94ba998a8af2ce27e4eff3bf378ca343 SHA-256: 4ef30d41e29c86cddb4f564a69c8549da14554fd9463c1500fd411afe9ca38a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains text related to 'how to make a fake incoming call', indicating a social engineering lure. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://inwebjor.ru/uplcv?utm_term=how+to+make+a+fake+incoming+call
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/603e1282259ae2fbb451489954e8879f/41873721250.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/70k9mh4st4ugtdbnbtpeig5qv8/62304672633.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b84e41a2d---doxoxavudebusagasodarok.pdf
    • http://www.kilincsweb.hu/fileok/file/lasitupolajujiraxex.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803db9f05ce---35264828487.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ba8ae2af8---toruxoj.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/80c493edd3aaab423931088080486e1f/67158342342.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607598700b006---59219946064.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ba72e988614e4a9ec595ad2f6b073af0/nufukalatebimusufugikej.pdf
    • https://aronabritcan.com/userfiles/file/83931620497.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c56db695f6b3a3458f9731a5c3daab21/sibuja.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/36843369841.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/1fl7cg5t1jltbugi81a3t6ucq3/gaxubakojifipiraju.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cafc.bin
98c166573c2605b4b108d0c34054781facddd389dff49ce9408f522c3ee75d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 5044 bytes
font_01_sfnt_off0000dc2f.bin
4671710c686ca728afc906bc8bc88371b98e0494a0e5285a94291cde1cfe1e08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 10088 bytes

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