Malicious PDF — malware analysis report

Static analysis result for SHA-256 83659151e1527a74…

MALICIOUS

PDF

73.3 KB Created: 2021-06-29 16:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: abfe1c98722e53967735fd967534c172 SHA-1: 7b5c7005a6fcbd8a3a71bb8c0cba7d7be0ebae3a SHA-256: 83659151e1527a74a2d20d8a6e4b18676e8c99ae3f6d2f028ac7e024a03b5eb4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=dilated+lv+with+global+hypokinesia PDF link annotation
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160797ef5e199b---tonadarabirajesazela.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/15798528e5dcf10915662085af50952e/79020140459.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/65868788898.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210521193027.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37dc8dee25---4804343266.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/ecacc53bc3eb87b5598496197fc71917/96612717032.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/51765960109.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b5a41d985---ribitobisumikid.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/20204860284.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607635bacb787---dibatufavefezelizewa.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097f256b86f5---mivemerip.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/29793282853.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/xuletotekokatowusanen.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/sixebujebezixonu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i5pi3mkpqmfeq81ttkqhb9jvr3/xegukoraxanowafomipubisi.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/fasefomuse.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d18567d528f69d501595088cfefb96ff/95545884947.pdfIn PDF document text
    • https://airbays.com/userfiles/file/winipuliramefinoremeniwi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/822f2e67fccc6e307647ff11a707149a/6467975472.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/ru1iamf2ivg471gag46vpdvka1/gemetakegoxenojevaz.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/kawubef.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160852e0706ad8---98556366762.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/zizuvofajitem.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16211106798375.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_off0000bdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDE 11072 bytes
SHA-256: 0e2a9a519b6ed982a9682d3b618f531b5eecc62589ac78dfa3fabc4bd87f06f7
font_01_sfnt_off0000d736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD736 15772 bytes
SHA-256: cd23252b38d018502e287672fa16eff2c634b37e56ad4439554d907a5011cd34
font_02_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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