Malicious PDF — malware analysis report

Static analysis result for SHA-256 a503415a34c6a5b3…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 08:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ee6941ce5266294ac264566564085790 SHA-1: 08352bc37ed6338596c904ed9b611d49954fac06 SHA-256: a503415a34c6a5b385c45a075659db6af9312f7d8dd6caf9f26ea9db4956e178
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or SEO poisoning attack. ClamAV detected this file as Pdf.Phishing.Trojan, and the ML classifier also flagged it as malicious. The document body is unreadable, but the heuristic firings strongly suggest malicious intent through link manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2cbeigplgoegbffd9iseq1l7e5/vejusalorezebudefal.pdf In PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a7055dbf4---37708356805.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/46819708652.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/g6mijr38mv17oterl4r5ju7g0e/timelegemutibiv.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/816ef91f758f6a3bfba5115b2348da02/47398025380.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fbaae2d0f413373c65e47480f0bcb2e0/57229831450.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215131048582969.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f276513d43---70304945805.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc8a8d3f---kibokivunilepitinovolu.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/113468540163da4ecb28ffa864e50ee5/vutupa.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/96000767702.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/xavagixaxebovav.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c75b6d0b0c---19844392481.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/golatuvedasevakaxulizakut.pdfIn PDF document text
    • https://happycolaborativo.com/uploads/files/wonabaxe.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1152636a---2646759486.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/xetujasuluvidapo.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/96164051760.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/24757389387.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/xokuvewegofedulaseted.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/f188e19175fcd3aeafa469f05cbfb4c9/66454920571.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/f8a18eca20f981679230c74ecd62d745/54750636264.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fcc44191b---xawiduveleg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=burghley+house+downton+abbeyPDF 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_off0000e375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE375 18596 bytes
SHA-256: 2319641ba581b73bebd1c60a2f92a1ac19c8bc7934f910b4e697c0dd61e587ed
font_01_sfnt_off000112b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B5 10928 bytes
SHA-256: cf475201a224e71dc5d0526c2a8f6241e52c829d6e8d2c3ba78d80dd8f83e905
font_02_sfnt_off00012be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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