Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93fe1ce784d6ad8…

MALICIOUS

PDF

173.5 KB Created: 2021-06-27 04:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5ee46a2a56091718f4f6950e8d77399 SHA-1: bf4078744212bf6df12c6f048347690c3af96638 SHA-256: d93fe1ce784d6ad899a37a947ca8385843d9cf31887aa6bf206277a616edd8b0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, presenting a link farm hosted on multiple compromised websites. The primary goal appears to be directing users to download a password-protected archive, a common tactic to bypass security scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a5a256a5005b0f5bae4608d13f7c823c/dukikopubexepafazuruder.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1689e65051---21898580944.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7659bace6e---gisuvojizita.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3630a35a93---69040634804.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c5824710---7549398406.pdf
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798676f0140---xigenepami.pdf
    • http://architettogherardi.eu/userfiles/files/84067769015.pdf
    • http://jtour.vn/userfiles/file/95160505645.pdf
    • https://acronimocostanzo.com/userfiles/file/tituwaxu.pdf
    • http://shethof.ch/cgi-bin/dynamisch/file/jorunokanavuxobe.pdf
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/23301350332.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd86324430---3635130277.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/4d90cb8bb93a9bbe29e1116c82abccd1/melixa.pdf
    • http://mega-gold.com/userfiles/files/23249902912.pdf
    • http://longvu.vn/Images_upload/files/pononerixi.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04e670c88---96524504738.pdf
    • http://progfin.pl/userfiles/file/pulogituxabugexivoxazibod.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084d317545f4---duwogenajaropedapaperu.pdf
    • http://obasekiestates.com/UserFiles/file/nekotevijexokaminudop.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2b4efb683def3ad6d5afa9bd89ab4665/61107996093.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1d6037a4a90d2436110cd4bbe74c3c80/vozofagagafalojepebuno.pdf
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/73649893423.pdf
    • http://appartenvue.net/appart/upload/images/kobego.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=overdrive+audiobooks+on+kindle+paperwhite
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d99c.bin
81ecc5f79e897923bd52d1ba816b1b982e8a1c6e307fde6e09befb3cb123451b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D99C 41424 bytes
font_01_sfnt_off00024626.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24626 16792 bytes
font_02_sfnt_off00025e38.bin
b07b78030f42f6916261922717625dcebfc181fe47473486b0967324915d84a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25E38 18520 bytes
font_03_sfnt_off00028e1d.bin
f6517d7018f93cbb7fb417aa0b448ecfc3fc694b8435377a11efaf1ccb3a34f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x28E1D 11000 bytes

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