Malicious PDF — malware analysis report

Static analysis result for SHA-256 672deefc30504310…

MALICIOUS

PDF

92.4 KB Created: 2021-08-04 05:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bd8bee662dacd204ae53d0f4e1e5c93b SHA-1: 6519058d362467b266ca7a907b4cd6a85ec35c64 SHA-256: 672deefc3050431041d446efd5689e9cde58b5e31f4c2117fdbd9e86c91268d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f0855ff1c744f83f510f09b6bc3a5b19/risitejexeze.pdf In PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6e3e42ae---dunevogu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/749f0e75a1fddff921a03dd9db04c2d9/87311291902.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/77292403694.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/4d4bd32041aec006646425fc734aa5fe/xomiredafaromipolowalogu.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/lofarexopogumixiki.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be827a5f48a---supekamujawipimanesune.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe41f27d2---24048671360.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/pugozufore.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/a3d9588f81ef402580c671c613e23e6b/5213295675.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/739c25bebfd2f90604dabf18038d921c/19863023770.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/77249205294.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8a2c23bff4b8fe8d98ec79f2fd627bb5/juxixugejibusezujesudoz.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee1339ec85---bipanebokomerut.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210714101957_evpkwh.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6e5e5c9ae---kusidovobadulo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8d76fc4178372a3f6e5d8c009fbf6aad/zupasotegaxanesekedat.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/18800784134.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9e71c1b59b2052aa860e29f7230e3384/ritijotonususufabozada.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/sapedi.pdfIn PDF document text
    • http://poorclarescork.ie/images/pawoneda.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/gexijufipepezukoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+make+a+double+knotPDF 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_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 10456 bytes
SHA-256: 41c45f32c8e6bf24a4baf0c14eb1dae9643b2f79f84782ddc85ec661f6dbe330
font_01_sfnt_off00011e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E44 17512 bytes
SHA-256: 2ac0cd15901f2b81472c1759ba26cf739a3cf6b4e70164b075a78fd46053a87e
font_02_sfnt_off00014bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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