Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea66cada7a626019…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 01:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 765c187dc2fa91b597f1defec1ac6ceb SHA-1: 18145bc43f4e4acd957b8ab953ffbf4acb6cadbd SHA-256: ea66cada7a626019d4f2e93664bd08d94be133b866d8c5c602661ca05b4ae177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to lead users to phishing pages or download further malware. The presence of external URIs and link farm heuristics indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=year+4+english+grammar+and+punctuation+test+pdf PDF link annotation
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7a6228024---dofalepafivudibokurogo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102538096b7c---vegazokomumaji.pdfIn PDF document text
    • https://hoalavender.net/upload/files/10395375925.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadb4d5d3---bozip.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/77999727883.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/xagoxenevumapi.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/21c7b39ad223d15417e4afae3d7aa45e/58057191584.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d69f90fed2---suxotosigibewemakubol.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/16784313938.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cnovaiflcutsfciqeto679mau4/33974409329.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/5hpkd3j2gpalfp9qmlun1pgqbd/36688158152.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/pktm8v5o22phlo2eaoeris8186/71171430202.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0dbd22a4283202aa0c6cf2881d8ccb51/12281623582.pdfIn PDF document text
    • http://landmanenterprises.com/clients/6/66/660ad4be7ac834282af30b44844c6003/File/52940544865.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/renobuladiwanigozizunib.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/0015cc81f3dc426c853d46dd8a92ea5b/4704616015.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/vewopozula.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/97879927831.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a898703e0---46480609784.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160826043dd49b---jojumipoz.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/54575728799.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8969aaba30ef46ae39392fe777e3fa97/sisapeputi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f01b2f9af---bosodokivaxawixo.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160941e4e89e34---vaxosogup.pdfIn PDF document text
    • 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_off0000bc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 11228 bytes
SHA-256: ce2c0ee009f5ca0e9e22737ba25056e2709ee2a1bc41e35821e0f78e5b59ecd5
font_02_sfnt_off0000ee5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5A 14888 bytes
SHA-256: c2d5857b6f22cdc488c4dd394a810b4ead3ff795b1dc9cd282a45c4b815f6b94

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