Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a199ca19f782e2…

MALICIOUS

PDF

94.1 KB Created: 2021-08-02 03:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f84971c89d0aa1a81ee0d98a33bcbb8d SHA-1: c61d51610d1a2276ade9cbbd3ba31d26080def46 SHA-256: f3a199ca19f782e2744e82c192569795e194d9925838087604b562d958f02fcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised CMS upload locations and potentially disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and its nature as a link farm suggest it is designed to redirect users to malicious or compromised websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/59f6fb6350dc3c5812b0a0c3f377868e/33251341942.pdf In PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/6550498f5d14f8867645094d437f8214/2093368095.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c504ec67---38205832134.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/vasajagizixirigisevo.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/63916128932.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/vemulupawe.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/14262932815.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69f18408f8---xiwotazotumakesexeterixi.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/50104068125.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16076bfe314f57---rozomekage.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/d49b84cd810b92d4cc3442038830dbd4/73229777504.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/87917184748.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c55b20cb4f2---vivavetopanepadepot.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/khunjvrvlqh3v2ufg1l5chr9d4/56888587211.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088448556751---rixifudanipozifatega.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/66286337850.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/e55ebb2fb7c638ede0b90c701067bd74/webakoduvijuxujebinolu.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/gogowuvutajisezotoxok.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/zemadawitofutawika.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e68943981---xopuvafoziludan.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/86131042985.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a20dacccf18---nitigabom.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/5cf3802f5a53c70af476718ae0295ea6/xezerikavefupudozuxabad.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba1266f3cf---jomijinogibigaj.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/vunesabadaxilepitirif.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7953e2788---dixabawogitawixeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vava+laser+projector+reviewPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 10516 bytes
SHA-256: f050fdef9530811dfc574d49b52959853e3274249c208018b2a311d9263bd554
font_01_sfnt_off00011a10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A10 1668 bytes
SHA-256: 0a4af374cb035e676210909e4790276a619635896d879aefac6ffd5912e9aefa
font_02_sfnt_off00012200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12200 17836 bytes
SHA-256: e539bbd213e4234ab1dc434b7a26ed0e862134e5a8184caff8e7199b7c5922e8
font_03_sfnt_off000150c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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