Malicious PDF — malware analysis report

Static analysis result for SHA-256 76dac915d9e89c7f…

MALICIOUS

PDF

85.4 KB Created: 2021-07-04 22:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5776e76731ffb3465504cb5dad3c7e56 SHA-1: 56360401209a1926c2607dc205ba616f1c309044 SHA-256: 76dac915d9e89c7f94e86722af8bbd9cddef82c8275cbb06629ad2a071887c6e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the document contains a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious content. The presence of multiple unknown URLs further supports this, indicating a phishing or malware distribution attempt.

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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d5f9a1cb0---madodedaladoposata.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/cb735d5e8c795f2e592cc9d4b9bd541b/tuvibizi.pdf
    • http://aklond.com/UploadFilesfile///2021050201202972.pdf
    • http://metall-press.ru/files/sifepugozexikelexa.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ec5777edf---zugaxufisakopimirufas.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f66e20833d---rukosojoladajigas.pdf
    • http://telekommarketing.com/firme_data/files/mijoxi.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a82a16403f4---17786624006.pdf
    • http://ontsgoi.shop/uploads/files/45708794770.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/dc0b8361c310f333b2a538b9ef233e06/vumagujej.pdf
    • http://austria-ex.com/images/blog//file/96267945144.pdf
    • http://www.bandungmesin.com/file/direjifowoxetoj.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c717acdefd---pifuxutinabepi.pdf
    • http://southfieldhigh.com/clients/a/a2/a202dccd336a30abee2d0a4364b9f07c/File/86197574520.pdf
    • http://funperm.ru/content/file/lasapaminipevubovava.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f410c0cfd90102b680c85e7419794104/71557645527.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/8208040639711508f058f250381e2c09/14853467919.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba34c22458a---pipobetiduderulemegipudog.pdf
    • http://bright-mineral.com/uploadfile/file/2021051622343161.pdf
    • http://wmc21.com/ckupload/files/zatirifemuvoguvexarijazog.pdf
    • http://cerescommoditiesltd.com/Images_upload/files/57596151913.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedf74a625e---20393492453.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a47edd4fa---97492300224.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=jake+the+dog+and+bender
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1B 16792 bytes
font_01_sfnt_off0001052d.bin
240f7f2879d57d349a8b94996182890ec664dfabc16be5fa0d6340c26c3a0a4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1052D 16780 bytes
font_02_sfnt_off000130f3.bin
bc90a3898a8dfc850eb662c840dc8825a759c9b0f92ea1bee9232cfabf77044d
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 10444 bytes