Malicious PDF — malware analysis report

Static analysis result for SHA-256 4325a0a14aa863c5…

MALICIOUS

PDF

71.0 KB Created: 2021-09-06 05:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 50f999b6a70480fae3596a4b5f98a6f2 SHA-1: 6f2540a8f2df99e014e7c815c5d0436174a63d78 SHA-256: 4325a0a14aa863c51124dcdc4fa1eb08ad18e316a1fbac66e9f75c36611c4103
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple external URIs and link farms indicates an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3ee8c209a---65392149282.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/553fe6igqcm7ive9cbfheq7jg7/8842937467.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611df71f4bbbc---koribi.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/niriwakegod.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/xututuvuzemuvegekifuz.pdfIn PDF document text
    • http://timesofbangla.com/uploads/files/voxirizijagitedutatugolax.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/50566732252.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/doliguxapexuto.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/gekireliginor.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/pigexat.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/vezavubani.pdfIn PDF document text
    • http://biafrapol.pl/pliki/file/67025702178.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/63306535399.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c34741600---21215686958.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/rofarelolowixekewe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e3390e3327d---29984501150.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/8f421adfe89ac868f98073ed39ce0c9e/duwiradaduwaj.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/9rva0ulmlkun9k6mpv383ijjg6/kanukixim.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/86537939119.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kuwumapuvesafo.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/vidivojuzil.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a181af24---fipipufilupagov.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b91fc499940b03584f4efd50f91ab622/15907241795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=2012+hyundai+sonata+gls+manualPDF 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_off0000b276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB276 10876 bytes
SHA-256: 69f415a85058f18a4d30188123c68ba7808343af37e4749648b32aee1f24341e
font_01_sfnt_off0000cb3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3E 16856 bytes
SHA-256: e9dc19361455255403e3bc8201592d53818e69d45d5c3b6d9ac19a4162b694d5
font_02_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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