Malicious PDF — malware analysis report

Static analysis result for SHA-256 9931a95ddae61580…

MALICIOUS

PDF

80.9 KB Created: 2021-08-29 04:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acdf07af274d9428039c2ecea9c6045f SHA-1: 4b70cc1c67a11550517f530f7e1857af8cde406b SHA-256: 9931a95ddae615800f899e4f65aa9cb58ecaf3296aba395534bf835d6319b5f0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as downloaders or redirectors. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern suggests an attempt to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160be4fd31245f---2478043175.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/519394b11836ba15e85f4d88d6cf70bf/95049193435.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/08595f88417e131d63e4a54c7be6eba6/54479795732.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722fb4ea5fe---12247183924.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/88998708184.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210621123547.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/98544183604.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1610a4d2d9f5c2---sevewezuzuladodujetugebog.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/da7950f738a03d762296d2722b6fca39/49635472562.pdfIn PDF document text
    • https://jetaime-shop.com/files/92946648853.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/83397236840.pdfIn PDF document text
    • https://sy-tech.eu/file/6297517941.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/jotubelorikuvubinoro.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ec3faf161f9---18556960175.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bf368372765577a2279eb997ac58539/96707240672.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/jokifulowedotuv.pdfIn PDF document text
    • https://network-italia.it/file/27140243420.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085569f0658c---7220518159.pdfIn PDF document text
    • http://farashimirooz.com/files/69537794466.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ks4ga55ngmek6iqjk2iq82t8et/favumalazonijuwivogos.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094237d9159c---vilevevugeraton.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/337af16b4c7ff59bfdc6fe7ca0d0ca0a/53126594840.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/suzabagajokesitewe.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/12e903fe124b9b6d37b5f23b4a5d7bc9/71783651404.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9609f85b---26723072972.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/6685295910.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/93f21298c80046d869e6935ebced85d0/puxivamuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=current+events+assignment+answersPDF 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_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 17628 bytes
SHA-256: 9d5ba4bb4a0ab55cff563476ce7f1eb56151ad6fad36d3db51c9c7c7d4d19fb8
font_02_sfnt_off00011c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7B 10568 bytes
SHA-256: 10f3d1561a37be082713b47bfbdd97cb1e72ea8b658b143dfef4eeb40360aacd