Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa65a3a23e9dec8…

MALICIOUS

PDF

128.7 KB Created: 2021-09-02 16:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 507c4f32ab9b95cd32ac4a2252f5e7bb SHA-1: 45010aa774c0bc13b5f5a0853f9a5b70b704055c SHA-256: 6fa65a3a23e9dec80ec94b3fccfb94421a00390fed25b7fad68fa2478a489b7b
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to malicious content or phishing sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://drafthe.ru/uplcv?utm_term=anatomy+worksheet+epithelial+tissues+part+1+matching+vocabulary+answers PDF link annotation
    • http://ratchadatitan.com/UserFiles/File/48387994808.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/selogufelazameg.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c82a5a619c26326a170ebcd10ee42033/zejesonive.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160719b38eaba6---96633182016.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e94b3167a2b---46333502710.pdfIn PDF document text
    • http://greenbrier101.com/userimages/kuzudemoj.pdfIn PDF document text
    • http://gardatrans.com/content/Files/fovalitorofulimufonevuket.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/26542799690.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/74130059778.pdfIn PDF document text
    • https://praward.tw/wp-content/plugins/super-forms/uploads/php/files/56cc7442d832ec8d6f4911bf35ab29dd/48280699663.pdfIn PDF document text
    • http://salkim.com/userfiles/file/65982641225.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/9880019796.pdfIn PDF document text
    • https://purefeeling8.com/data/file/86227951636.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/seseman.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/oekpsg0qmb5e4k2juqm0r31uhu/nasorusizedavaxe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bee49e82d---kenofeput.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/pilatuku.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/bigejux.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/84406184520.pdfIn PDF document text
    • http://jfk1969nola.com/clients/873000/File/76636502998.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/kudarex.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3e6e01464fe98a1799cb10f3733b6d72/6506718808.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab516ae68eb---59463191511.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f5265ccbb---nizimezuwid.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_off00019194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19194 18336 bytes
SHA-256: 17ee3e8f3897be85e558d5414a9c28aeb03060d4b45dabcfd1351c068f671e9c
font_01_sfnt_off0001c0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C0ED 11452 bytes
SHA-256: 6eed9243ddc29d2edfeaecb10da94513c36f62b35feb118e74590a35cfd60fff
font_02_sfnt_off0001dbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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