Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb5e6e73fa9fffc4…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 05:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 09ce44c5d0a01418a69ffd42db66ac14 SHA-1: 054ade1b645b8dab19f676b011cdb9427ad1ab85 SHA-256: fb5e6e73fa9fffc4bf990390a624b292dbe224bb5f5108e4797ffba0b9bacec2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection as a trojan indicate an intent to deliver a secondary payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://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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