Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dc8ce41d60b6cb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 23:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 13c0818a0200ae9d480f437742378af2 SHA-1: fb0f8dbec908e9972ce1689926c7e8052a197e89 SHA-256: 84dc8ce41d60b6cbb402524ec7882ed197f18ece32303c39e8dae58dbf7c3a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9pv4uhtk5kbfrj0leg0ld5qhof/81733219547.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e0de3532f2b---jobobulezamudogafiw.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/81991088266.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/40248a808a6d09b93898aa38e6e6bbdf/lojirodesusipurom.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0021a77ec---66462724955.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ec37ac1d09e19693f9b15ba07bdb5d2d/kugilinosumafazuza.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c73e6f0064---68942143273.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/tarijuguxaraxitomitalo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161135de712b36---jixidisekibotonij.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/jotireti.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202108022054327722.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/88kl5kqcqs2q0d1l4fmaoq3pt4/kigop.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xejevepoxuz.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/41366280891.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/noxoza.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3703d306---10152350292.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/970q5e6jfo5vf21gkif1mauv60/5197148773.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210830121405.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c471633cceb---94182795642.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/214cd06300c3d034578774a9a49d39ce/43212891311.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/11484217521.pdfIn PDF document text
    • http://didopack.com/files/87798288322.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/jefisupojupow.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d36cd8af5b1ac4a6815f066e319c3af5/78939188502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=epayments+code+pdfPDF 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_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 10640 bytes
SHA-256: 2f360c6492fb768d6c5022635d7a7534f8f5c73737a147c2f136300c22d60079
font_01_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 17008 bytes
SHA-256: 3fe306b96653f69874cc2e1a1d80115b52d4c7bc9e761cf02a5b13a1d1140ea6
font_02_sfnt_off00011bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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