Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c398b28c9dee96…

MALICIOUS

PDF

75.0 KB Created: 2021-09-21 12:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3a604dba528ff02909d26a03d0ba5687 SHA-1: 58dad7d05a216a8aeca35d43444cb22829b7f131 SHA-256: f6c398b28c9dee96d64737db048489b5f94c89c2878d770ccea31cc614ee5f6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=android+tv+bluetooth+app PDF link annotation
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329dfe41faa---jutaxekepixo.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/masen.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/garejaxapevajijedurodef.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/gekiboxisufafuxemir.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/62378620506.pdfIn PDF document text
    • http://dalaichau.com/files/lutivoma.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/legovonixadipajikud.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/xuzugoweme.pdfIn PDF document text
    • https://semangkamerah.com/contents/files/xozamipizo.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210908_F079E376049E68C3.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/331b155be47fb9e71cf8c8709c295cbf/68637571809.pdfIn PDF document text
    • http://strategieb2b.ca/userfiles/file/78106247956.pdfIn PDF document text
    • https://tebra.si/userfiles/file/56924167507.pdfIn PDF document text
    • http://cmtsport.com/pliki/70558335196.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/aa661e5cc1b4663fcf9ce386bb4bd3af/57944043765.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/jagadekuxen.pdfIn PDF document text
    • http://missteenqueenuk.com/userfiles/file/xijisapivedemesadaxivil.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/161349685dd671---20691169304.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/92796582222.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/fofibagagurut.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210910174853.pdfIn PDF document text
    • https://serihosting.com/calisma2/files/uploads/kewoduzil.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/91026827627.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_off0000c41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41F 16344 bytes
SHA-256: 74c26c15bc698492af3c947ec7858a837197724e67b13a0d9d40bcf61a7a4ac1
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 10608 bytes
SHA-256: dc62f0e9f8b379671994764cc11fa184f1e42c7d52800c49101d493126794034
font_02_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1