Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9794980ffb799c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 16:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9dc43868f2949ad50bfc3ecd12146f0f SHA-1: 184432e9568b887dcb39ee20bfc9e68cb3cfdc57 SHA-256: bc9794980ffb799cd88c4a221328a5e42c7236ffbbf9999373fce70aca3a19f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the URLs and the overall detection suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://stalbeckers.nl/userfiles/image/file/sofisotu.pdf In PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vixakodatoni.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/79203134417.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/lotexenozolevazesu.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/8310542877.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f746e445e2---disulofag.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609643fd1b24d---fudunujodapeko.pdfIn PDF document text
    • http://megalaserasia.com/upload///75793324739.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/kekesapuw.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/31148935351.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/97265673482.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vokan.pdfIn PDF document text
    • http://zaiger.ru/img/file/mativagetidorolegekan.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5f82e9cdba7415a60fb34074695b87a6/76972155778.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/makosisunate.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210831064444.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/60134216647.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/nuvixewoxenixezulajo.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/89815139427.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/94q5eh0gh1nvusjdei1ubq89a1/sukuzeduz.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/9u8an3fabvs5rq5fnm9gtda057/61823781467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=ferber+method+crying+for+3+hoursPDF 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_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 11220 bytes
SHA-256: fae625eecc417c370e4867bc2440de463f802cc489c027a9c60b7a607bffcb08
font_02_sfnt_off00010fcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCD 16752 bytes
SHA-256: b7cdd40633335d5501f38f8d5e2cdcb0b27a85fcdd130b5bc9f7aed893261ec8

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