Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdc9c0c51d4a124…

MALICIOUS

PDF

79.5 KB Created: 2021-09-13 15:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 862e615b9d90baf9dba5f57d6cd9d431 SHA-1: 8879d4094778ad05cfbe36a139cf801366f73212 SHA-256: 6bdc9c0c51d4a12410038aa9c189d9427f2074f22841c1111de545bcc9593d4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=car+driving+mod
    • http://maschimaurizio.it/userfiles/files/kotojemilawabab.pdf
    • http://77owship.netsociality.com/upload/files/pobaxadufa.pdf
    • https://louvre.lv/res/wysiwyg/file/befejo.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613af5f71d402---wenefomavitemok.pdf
    • http://asbu.net/uploads/FCK_files/file/40872593036.pdf
    • http://leicesterbiketec.com/userfiles/file/57305414948.pdf
    • https://retta-bg.com/userfiles/dutonoxos.pdf
    • http://lasantitosrestaurant.com/userfiles/file/66949201119.pdf
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/lofiboku.pdf
    • http://interwork.sk/userfiles/file/73061010801.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///90247334042.pdf
    • https://www.rougeindigo.com/ckfinder/userfiles/files/mevanipese.pdf
    • http://odumakus.com/uploads/files/24435058817.pdf
    • http://logopeda-empatia.pl/content/file/65525621812.pdf
    • http://problemconsulting.com/img/download/files/63409001734.pdf
    • http://belean.pl/userfiles/file/difugovadopir.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132100a9ea58---31917891258.pdf
    • https://tebra.si/userfiles/file/kasonejuvixotosozetaxo.pdf
    • http://come2menorca.com/images/file/wefopigawotetoganesel.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16135ddb15365b---niwidazadit.pdf
    • http://studiobaldizzone.com/userfiles/files/9159534391.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67f.bin
5420b0b59da7b4b3aaf9058c5d6d91ee5248648d4c17faeb3f247440e9ec3ec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 10244 bytes
font_01_sfnt_off0000ed3b.bin
08a6cbb7e7e60eb81e0a4128d61c2795e8da4251a77f2941bf9dcc89f72c9be1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 17180 bytes
font_02_sfnt_off0001195b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1195B 16792 bytes

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