Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3df12bf5c11ae2…

MALICIOUS

PDF

78.4 KB Created: 2021-09-06 03:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58b2caf79634f46678ad6429e1b71c0a SHA-1: d0d8e60ba2b455653f52a9ec4802b2cccde9f337 SHA-256: ad3df12bf5c11ae2a8966227bc10f9d5f747763961dcafa8972794681fc3dc26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various websites, including those on compromised WordPress installations. The document body is unreadable, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/wilowiwuvinaweja.pdf In PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/e3d2897e2888f3b003be682f4804ccf4/46295699121.pdfIn PDF document text
    • https://superpart.com/files/71057055465.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/ronavanotuwetowam.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107d899c29---jomun.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f8b8b4297---figogebodilupoduvekamab.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/3198765742.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/8aba3d01434d268a5852b8e740de56b5/limukifag.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/datebimen.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/83180519725.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f63d2d279f---kemol.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/95c7ad96d9d49ac07b88bc6a4d8e4e36/96633612173.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108300525064202.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/gugomokemigesasese.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/nezilizatavekavifitok.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1611213ff119f9---78190152904.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/jofutavenapigivib.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/xomevuwarowejotol.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/312a2350f148c0395b04eb14844f4af1/51263794644.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/koketibukoposupu.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/is1ikdqtuk9vqunv7djcbmia47/63990973696.pdfIn PDF document text
    • http://www.nagsa.es/ckfinder/userfiles/files/64219945149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bistro+fada+chords+pdfPDF 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_off0000cebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEBC 17312 bytes
SHA-256: 617f66112b9101915772344dda47daaa887eaa875d558b2a85277c999274ae08
font_01_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 10488 bytes
SHA-256: 00b021be8b2f0ca9a8c5936de87dad94d4269a4ce96985ffa39659b3bfe0b837

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