Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f650e7bf9a42c0b…

MALICIOUS

PDF

89.8 KB Created: 2021-09-06 23:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6aaf2bf30b5110e3891369f60e0fecd SHA-1: 1463114aa990d42f4d7ceb7ca332d18e3a19626d SHA-256: 5f650e7bf9a42c0ba090a958af6940b671ffb4ec6ce8848825fdfeabcc020424
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it's used to redirect users to malicious content. The PDF structure and link farm heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/cba020f8739d5b323b5a64f84c3b4aff/wijijepidisazenotujofijo.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c680b1eef81---pozozuta.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131f6ccb8e0f---pirinev.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/6234835338.pdfIn PDF document text
    • https://fobh.net/userfiles/files/sezomajuz.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/83245363421.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621561301.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/sotarap.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/10350191195.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/pomexo.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebf40dd79d---37159418575.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/2243784673.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961117c5cab---38296069196.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/2991097036.pdfIn PDF document text
    • https://best-label.com/upload/files/barinodexaxavefumumi.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8c083d5d3---vuwutebujagadunegemonag.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/3943459755.pdfIn PDF document text
    • http://chongros.com/userData/board/file/resekerexutolurujas.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/62178103346.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/13c8f2cfc9657cd8e40e7559be988a1d/gokol.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/cc3b6d3df95a9e5fed7fc27b5db071fd/24935147828.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c592777b5---797684247.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1428cc91d9---niroreze.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c13a02c182d---pudopovixa.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbc9056e3a4---89514938987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=kriya+yoga+meditation+technique+pdfPDF 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_off0000f357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF357 20264 bytes
SHA-256: 76c3c22abf75f76458d8c6d9be5eb00e079fe9b9a5d3b8ab7fbf3990ffe37dec
font_01_sfnt_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 11204 bytes
SHA-256: 16810f935407bad76e7f904e41abe65424a5b3510ebd9cdc584a1d457fed9e9a
font_02_sfnt_off000141b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1