Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbd6a9feb665c20…

MALICIOUS

PDF

80.5 KB Created: 2021-07-13 18:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ee7c56c035e6b7900c8149466e42ec86 SHA-1: ed19a0749da39545270af763dfde0a6982469fa0 SHA-256: ccbd6a9feb665c2009292421e067fe7ee0f95999fdec971734ce7f564be174a4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=square+root+of+15+by+long+division+method PDF link annotation
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a7deb24232a---segoxujamolopumutax.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/4ohou8n58ceq8istr7pis5e020/gerajorevikokolizeseder.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/furipu.pdfIn PDF document text
    • https://drnanemilk.com/tctt/sites/aaa/file/96283765477.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0a40fa567511f5a010a955e5f84da00d/migake.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/26953290799.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b41dbaaa02---kuwewisakizokugare.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/qs1mrlpl7g1qf9ila2dhouvof0/bimosif.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/50742468410.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/nugabolin.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/likomexesep.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160984cad9e0cb---33627250715.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/6950167f30a86ed6f322b54a9a4c93b1/budejigudumugobofetoxerox.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d24a779ef88---91041245185.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/8670359494.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/68343304203.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/33061970811.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/92895564053.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/54266873771.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/xuvaluwafiwomapat.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/sapat.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/o639379c4os4qp40hh04njot2k/punilujodaximaganadaxanuz.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/36242507736.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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 11628 bytes
SHA-256: 38c6800a6af8ef042b6815ffcec93697ede4c6c0887a64c4eb95b295e2cf84cd
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 16972 bytes
SHA-256: e1b27d520d775c94ffaab6a897e8ba384fa06cdc54b557f6ec172599e51f6eb3
font_02_sfnt_off00011cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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