Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cb97afe07bc9bb6…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 04:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c97b653f18fefcbd7c6b56b7e73499f SHA-1: cda9288932ab916f0742287c94b3b5bf5c24a484 SHA-256: 1cb97afe07bc9bb695fc64582ce796a2b4877ccf4577040517222107d94b73f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. While no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious intent, likely to lure users to a malicious site.

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://almuhja.net/ckfinder/userfiles/files/garekebasujufikotuxater.pdf In PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/vagoxade.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/73101345475.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/55737272070.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/32192857028.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/rubapines.pdfIn PDF document text
    • http://gaudi.tw/upload/files/tawoxa.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146773ec934c---33126499642.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/52031977790.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9c31e640470f64b5b69bac932c99c2b6/pukuvev.pdfIn PDF document text
    • http://tochalco.com/uploads/files/34510677335.pdfIn PDF document text
    • https://ghnservizi.com/file/90276541348.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/detisaxijebires.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/mudupemorekefogugowepu.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210907141319.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j8v68o5lcm6ki7idqv0904qeq4/73616668318.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/dokas.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/dudigubutukizu.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/menoduxu.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210913200945.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f76bd24de5---24840097542.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/gadususixinawafivijozidef.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/71472818754.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/85700965327.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/vuluweso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dabbe+3+full+movie+with+english+subtitlesPDF 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_off0000ced6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED6 19520 bytes
SHA-256: b7039b3cb1cdcfc807b02254d85da0a02acd04b88ea98ad6231f35b45ed10959
font_01_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A44 11128 bytes
SHA-256: 73cdaef064ef7b58b7767bd9ecc224b457a987d79f1e91e234f20abfc7f9bb80

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