Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec36031b998483f…

MALICIOUS

PDF

91.2 KB Created: 2021-07-01 18:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2222ae880c950f16fcbd06f66109a182 SHA-1: ec7672cd634c8c600c9af88f117c7458b73222b5 SHA-256: 8ec36031b998483f4740488ead9cdb60629cc44b7d0a58cf88657f654c6e3c3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs, such as 'https://catamma.ru/uplcv?utm_term=ms+office+2010+free+download+full+version+with+key+64+bit', are likely part of a social engineering lure to trick users into downloading malware or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://catamma.ru/uplcv?utm_term=ms+office+2010+free+download+full+version+with+key+64+bit
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f708eafd5---54204383131.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/kle9r5ueg6vr713c7ab2u6b6nn/nugokepitijofenod.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160942deda7867---gijifa.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/90nbf6v87gqjdo7pqnah3en3bh/kebitemerolam.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/35ebad9132fd1c81472ee8707b3f196f/lonamolonelefezam.pdf
    • http://ozdoby-betonowe21.pl/Upload/file/50882187153.pdf
    • http://benhvienlaptop.biz/userfiles/file/78440258871.pdf
    • https://airflow-skateboards.com/upload/file/63446671254.pdf
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/52477097409.pdf
    • https://cuisinescartier.ca/upload/editor/file/ziwuvunakodefifukavina.pdf
    • http://younewstoday.com/task/userimages/file/nikusunupiloziv.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/3rd0q7a51m9fqfsmcg3bhh2207/72097421103.pdf
    • http://come2menorca.com/images/file/33583192187.pdf
    • https://mobilieroccasion.fr/uploads/file/48995394781.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/e4ce52cff5316c5290b85e95c9812de3/baxekubexovaja.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8fbeb3528171d5ef269727bce624dd3c/9811647889.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1e6b7202c---15303081177.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08952458fb---vuximelupebunewopadu.pdf
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/48761050648.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gob95dvtpnh0drerjv0d3e86i5/ruretowaroxetedepizow.pdf
    • http://dzbnf.com/upload/file///xijugaw.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc62b8b034f---55662282489.pdf
    • http://ballstonfamilymedicine.com/clients/861402/File/77108315561.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa598239854---lofokotorovefoxapuped.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_off0000fc91.bin
e826f094d589ed418a5f03822d08f150c105f98e7b20946c2b3007b382b378a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC91 11704 bytes
font_01_sfnt_off000118ae.bin
f497d68973bf1357f01feba60a646a2549e6e9add43094505967e05b4d652773
pdf-font-stream PDF embedded font (sfnt) at offset 0x118AE 17708 bytes
font_02_sfnt_off000146fe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x146FE 16792 bytes