Malicious PDF — malware analysis report

Static analysis result for SHA-256 3477247e21784ddd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 01:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d81559a873e98880adcb8764bfb2e380 SHA-1: 37de28899e9e3e5acc3e6b058432b51371f5d623 SHA-256: 3477247e21784ddd5b7ebe3ee4b784abdf57394b482841767707b7ad01153464
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving further malware. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL patterns are indicative of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://castel.ro/userfiles/file/raluxakeridig.pdf In PDF document text
    • https://vinaarc.com/app/webroot/files/ckfinder/userfiles/files/wolilujujebesijer.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/29255474497.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/pofolumigebejava.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/19249178928.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/febewonuvokefugotaj.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/20666849326.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/gadavajefetomim.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/73635599401.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/mozagibupofa.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec717c8cd99c2808c92a10ed1f9955d5/venevizafiveluzov.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/88r8tlkg7cqluflg8phqpf33s0/41543696910.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/81008351474.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/30550251988.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613db7e3d1780---jezojafovoresavomutipasis.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/75255590770.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/73583506363.pdfIn PDF document text
    • http://hoachattn.com/image/files/47704589029.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/43424795982.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/lowimiromaluxibalumimu.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/nirategufebomorixex.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/79609980162.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb00f20264---60816209304.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/burujada.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614185e56e42b---rawulozudegex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=note+9+size+screenPDF 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_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 17508 bytes
SHA-256: 3830bb5776bdad087d97eb66ff290bb30920bb83865eace17e4f62d5501ea49b
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 10220 bytes
SHA-256: 6cc52216194d78f9451a0702fcf46674f289ed39ecb7ee580b7790de2f949bf1
font_02_sfnt_off00012228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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