Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d1ab6fe0e43971c…

MALICIOUS

PDF

81.2 KB Created: 2021-08-26 04:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb7926cfc7e67cefe74adb592b3b97cb SHA-1: b0427ac2fc3621ba6e78052d5a52c9094cbdb35b SHA-256: 3d1ab6fe0e43971c29de4a9394eacc0bd3182b57d72b4e4ddf9ae354e2347505
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains numerous links to potentially compromised websites, many of which host other PDF files. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document likely instructs the user to install or connect with a remote support tool, a common tactic for social engineering attacks. The presence of multiple PDF link farms and the ML classifier's high confidence score suggest a deliberate attempt to distribute malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://retroldn.com/userfiles/file/paxafepusalupewelap.pdf In PDF document text
    • https://loyallcanada.ca/editor_files/file/54134519098.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/56956884394.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/vijixivoroviwefejulaviro.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a86f0c8a9044f14ef7443e68cfa9f5f8/63062825052.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076eefe260b4---rewuxupogofovinafiruzu.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/56552508566.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/vekodoxexedonofozujedoro.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06abb6241f---32546451595.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16094cf7dea778---44655281897.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854ff34d002---seguzifojeberonolipegule.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/32dvevc03gqru8guss9k9c17lu/jogimagifevimotapil.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/860116e8c682bdb88ddcd4b9ff0cd927/fifukagofa.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a442b47e0e2---wemikuridenodumobig.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef44bbb4e7---83932158997.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/renovoni.pdfIn PDF document text
    • http://cycling-software.com/files/file/gefofotufemosob.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/42157088000.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7f12bdb44---78190539614.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/57973587df44d1bf668ed894ed3c8c7a/gipanoruwapapafolar.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/34402816611.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/tofiripamazotuvavirasoj.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/nezekonetino.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a05e442da---xowexenisagovizelu.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/138a838675d18d5d48d178015957b95b/rasomupijurigitemedadime.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afe4add659---vibodulupejunitonaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unravel+2+touch+and+goPDF 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_off0000dc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4A 16428 bytes
SHA-256: 3ffd29f59c611dff315c9226a4c773910e0469acd6e480891a357ffae8bda3a3
font_01_sfnt_off0001072e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072E 10680 bytes
SHA-256: 0b9de4d83c381f01fe8b83a5ffcade7af9acebd3dcd4a515bc7cf1b2559d075f
font_02_sfnt_off00011f7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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