Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25085cd035f3413…

MALICIOUS

PDF

81.7 KB Created: 2021-08-01 02:31:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b41cb34af6955351d724fa043c79747d SHA-1: 04e2041b9d798fecef65e7245365e3b7e3ab2f33 SHA-256: f25085cd035f3413f592fd409c36ccaf9324a108e3b13eed63eced538d3553bd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the PDF is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://narnivet.com/userfiles/files/ranuxonopazawofuzumakataw.pdf In PDF document text
    • http://plncse.hu/php_data/file/85323444543.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/fe4gij92jeecuctmnh55mc2oi3/54313362674.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2a14dfec1---72303955707.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/zevubagarugaliwuvop.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210612_84E1277FD6B6DFAF.pdfIn PDF document text
    • http://vhktn.at/images/content/files/109441304.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/zukuzagoraliwem.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/49525223528.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fd705abae---66128570356.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/tugorejejaxulap.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/52794592555.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607050b88d1cc---80737504214.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/62372493165.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/dcb11b3150e5cfb006610a5111854b07/sefesuzizivawumul.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/vudasuburu.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/jijabaf.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/68d8807c670fb325edf20c9135fb0b18/74506373818.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/91834616271.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086186ce67bc---97315321139.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/94583174758.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f6d11a84e---10830541624.pdfIn PDF document text
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/39959308603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=iphone+ringtone+download+mp3+for+android+mobile+download+freePDF 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_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 17188 bytes
SHA-256: 76a31504efac6dcea42f228a870ba90ca818f5387b45b8e50dd93c5ecae7ec9c
font_01_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 11128 bytes
SHA-256: cd7ac5a4f91f91191882c588475a27a8bea441704debb63e18cc5a26265b5ea1
font_02_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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