Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33a1e4f5c08178a…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 16:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b861f6548b015e6b153cda30e2ccdc9b SHA-1: 1b8136bb5371441cb67306f2a8ed6426eecd00cf SHA-256: f33a1e4f5c08178a08ea2a782aab60ae9b95f0c29bcb359da20db7dbe50bcc0a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a link farm on compromised CMS uploads and a potential invoice/payment lure. The document contains numerous URLs, many of which point to PDF files hosted on various domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of multiple links to potentially malicious PDFs indicates a high likelihood of a phishing or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://majorpropertygroup.com/userfiles/files/pilepakamir.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/ee9cdl0qa4nockorrd3s77ptbr/nemonijerenofegupapoxo.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bad3f448609---jerarosawotapox.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4b3ea9b538c95f2fd4e6addf1306294b/2949573917.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/512sdiljagdc2790j72p2qqlj7/49094928209.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/neh1vrd3gk8aqu4oe2jh2jinij/nesepe.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/4f69661d66397563406d66ffb87a74bd/46415637451.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad9973868---95820654236.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b687044d5d---7560432677.pdf
    • http://hzbmsj.net/images/upload/File/sagolatimikajuxabog.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/297e507981614abeccfa49a93b182ba6/fuvupasaluzuni.pdf
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/lukaxufudipukavuruf.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/0gf3kjdu8mil5pnopcds3k9rar/nabegatazoridadatijixu.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2dc954eaa61d61f4f6eb911d5cba1c5e/41071256696.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608108a25ce6b---vokagalurubigufe.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/55251707586.pdf
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/d8e758f20d102ac3bc9b3d3de7768200/fapegametobifadozago.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a521ac5ad02---niwonefinutifuwin.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608452006f5bc---mesofibitagomakivowi.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/33201568914.pdf
    • http://thedreams.cz/files/87347825518.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/e72fpuvftovdoiv8efoh9upj62/37109252715.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/jowum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=amortization+schedule+house
    • 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_off0000e836.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE836 16792 bytes
font_01_sfnt_off0001004d.bin
a117b8103a4441cd4213552464b469576f6bd671c7c5f954b154f5dbacd6e8b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1004D 10776 bytes
font_02_sfnt_off000118f3.bin
7ff7aeafaa2921bee29dfb19d137c8a689d4baa2628013609427e897eedf9c33
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F3 16624 bytes