Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1a263bb83730cc5…

MALICIOUS

PDF

90.6 KB Created: 2021-09-06 18:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1d7bfe1c0e3e447e3ebd99f7d03d57a2 SHA-1: 5cbae8a85d2d58a998f601d5edeb2ec355fb6719 SHA-256: f1a263bb83730cc5bf4d676696786696eaaf5986ce257a2777d733a60c992983
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=how+do+manual+transmission+synchronizers+work PDF link annotation
    • http://happy-travel089.com/CKEdit/upload/files/rowariropukakivopepavat.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ca828665f3183d9fab241c0c751d0f70/67000613286.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/vokuwop.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/kenuvowogu.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/fuzonovowigiruroz.pdfIn PDF document text
    • http://change-sexy.com/files/files/rulabagimosubopotukuw.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/xakiwaberesezumovibet.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/80835195200.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/numutajikegapunavamuped.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/bbundjj6vlbd6k1fokfbm21ds3/sepijakowuvezasimu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c527464bebf---watedonejanetiwamasaw.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16080460dc528c---kebosupopumovexamepijimu.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/21e8d0dd7e6ab383a1de278646dbe597/zuvivisaxugavofamalu.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/femilujeji.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/zuxesagijutawuvojepesuj.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d0419bf7---kunitalun.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/vusibenunapafefuzajatol.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/b51kgad47br6svd1f44i94qmc5/nobobawumixew.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/repifebibilewidozewuza.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8676b059b3---nopovogaja.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/fukelowodo.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/fubozinitekusagelej.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ft51egpdp2jp05qd3jearrc9pe/88810037004.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/8aa96ec02571d6fc98a4b129156c9b9e/28816351204.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_off0000ff63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF63 16664 bytes
SHA-256: aa414b5e0476e7987290bb1c8b37015a9a61660e9d1640408fb251998059e0ce
font_01_sfnt_off00012a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5D 11076 bytes
SHA-256: b5dcb620303b904e613c666f2751bd0433bbe175908de8dbd067b30523656416
font_02_sfnt_off0001440f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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