Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a5344ca9c8cc50…

MALICIOUS

PDF

79.6 KB Created: 2021-06-30 07:18:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0ba255e48317761b9f1b6620a7bc66a SHA-1: e0a2043faedae196fb4284b8864b5bd2cd245137 SHA-256: 10a5344ca9c8cc50e95ad505f9599be5b1cc7261b2a21d26b2f495460192b701
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various URLs, many of which are hosted on compromised WordPress sites, designed to trick users into downloading further malicious content. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious sites for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/c9c47f2033f525c4131945c1dd0f4985/nokinon.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f81400a9a---muzesi.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcad228b3b---mezukuw.pdf
    • http://coreaad.com/DreamDataUpload/file/43000087361.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc18fd2021---60613147206.pdf
    • http://marthomaiticherukole.com/userfiles/file/70595538146.pdf
    • https://langumeistras.lt/i/File/37000632697.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/2fo0kvkcv56pojf8ntcj4iekue/46267983128.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7c2faabe3---25716376933.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/vonokimiwegizekimi.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3fe29984376f64b0ab1168cd6703c268/nafujiduzutavukamowul.pdf
    • https://phuquiland.com/upload/files/41641125791.pdf
    • https://iohrp.org/f_files/files/7402345014.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80b0310d2---kevidusagizosisuguj.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607400900dc62---tokegu.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/941d6c1719e39c806ee2f1c43ea2f0d9/mabutagadavejimofe.pdf
    • http://157.230.241.115/image/upload/File/vijazekijetavisig.pdf
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160741edf3983a---4621408662.pdf
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/73843617123.pdf
    • https://wecareu.net/ckfinder/userfiles/files/ligakeneguvipez.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6936c7154b---lanifagajovefiwi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=prefixes+worksheets+with+answers
    • 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_off0000d588.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 16792 bytes
font_01_sfnt_off0000ed9f.bin
ddd8e7d873636b6e533083ab5f4f055cba99d12acb0f4e8fba79d0658c34fee1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9F 10548 bytes
font_02_sfnt_off000105b8.bin
0d99866fb3d84941212afebd778ae06257def3da09786ef7db06886e829a0a6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x105B8 16848 bytes