Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8ad79d3ffadf667…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 10:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 949f249262b19404bb0afe0dbe18e07e SHA-1: c26a1ecee53240109a35544b9641712f9b931c43 SHA-256: d8ad79d3ffadf6670ffb50d2d3cf5199f11e116290aef14f54c999f71023cf52
196 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a specific advance-fee scam lure and a ClamAV detection. The document contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ec14531b---vobapufudobagumowaki.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9572da42ed---44457533263.pdf
    • http://naucseto.cz/storage/32986281866.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160762824444f0---26129279771.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/lqnqjaf76aopbtbt51ubc854ag/nudelos.pdf
    • https://sukhayurveda.in/userfiles/file/ziraribe.pdf
    • http://kraski-chernila.ru/resources/file/fizefejasesagitimixewuzik.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/pqjmbne1m4g13sjub7jr9mftp6/15768929543.pdf
    • https://aawyx.com/sites/default/imageuser/file/basozuweb.pdf
    • https://sca-kc.net/scauserfiles/files/rafotawafifi.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/59d9c671404b2ad5d8e14f969be81b18/55372477350.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d161fa5464---7708997939.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/4cbd104a8990bc88500868fad772d626/68740029698.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f0ffba99c204e541088c5a5a494af051/80958311102.pdf
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/49638872117.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/likoxutozub.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c4e07e8f5---98925822457.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/pivirupixipogatij.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/7906608e3ab585cc8f1c233518660892/59389637576.pdf
    • http://kojeneckezbozi.eu/userfiles/file/jovoxubexelozoxosabagef.pdf
    • http://clinicaveterinariabilancino.it/userfiles/files/65034139190.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/9ibupkjbod1q3s2lqnbsr9ca62hrp1tu/29030331428.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5eafe840f---nedadudewarawalike.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=stocks+down+after+hours
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d2f575e0bc9e0dd81c30bc628ae6438a/63341352970.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_off0000e674.bin
7b382d4536dfb8454c3a768a6a5824339efc232910fd8628dea4ff195aab886a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 10788 bytes
font_01_sfnt_off0000ff58.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 16792 bytes
font_02_sfnt_off0001176a.bin
c3d4cf82158b7a0d62341b79ff214cf5f588e71e8c04dcb3223d98fd190b6302
pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 17220 bytes