Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9354d3d961f1c52…

MALICIOUS

PDF

82.1 KB Created: 2021-08-16 16:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 263f5d6e996d733721382baa4910be24 SHA-1: da00b89341e3bf253278feccc80798697c807b15 SHA-256: f9354d3d961f1c523eaa6274b823acf8e8b23abd84e49287c0a59cd441be0004
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of multiple external links suggests the document's primary function is to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=account+manager+interview+questions+and+answers PDF link annotation
    • http://keitbg.com/images/files/53297009714.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/timisixaxuxawupiwamudal.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e39a089bcded346f9e53e9ba3df15fd/50655526781.pdfIn PDF document text
    • http://www.moyekolodin.com/files/17924215332.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/kapesot.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/f7fe3b78bb94fe54d08215e7443b2016/94142257013.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/44050900795.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9e7a7c2304c53b6f829ae3b8640708ca/8026554086.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/21304jgvj3fl5etb7ecm1r3i37/65989850012.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/33294173497.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/zadeterinalure.pdfIn PDF document text
    • http://legendtec-eg.com/wp-content/plugins/super-forms/uploads/php/files/ouqgle7pjn274tpj7k4p80his7/kavopozageman.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609733c2aa3e7---lijeze.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/q0tfjtfmlf8abcd8ahmpujpq02/vizizemiguxabumudux.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cc78e8603f0---32707886885.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/gisiposazoxok.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/dozeturejob.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160711495a53d4---75273240138.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/poponawetat.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/dosikeporirat.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/13218437735.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/tufubotima.pdfIn PDF document text
    • 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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 11044 bytes
SHA-256: 5189c32f25ad29473e08f22c3f88b7db6c4037cd4c1f2fa441ba92db59e408e3
font_01_sfnt_off0000f44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44A 18160 bytes
SHA-256: 74f3265c6eac1766df9df5c81bfa793c4d55b71ddcc67d6b938384a52f0c1a08
font_02_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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