Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb29679f3fb0476c…

MALICIOUS

PDF

89.0 KB Created: 2021-08-17 03:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87c129378f67924fdb07071a01dfa6d4 SHA-1: a76237b455099acd7002ff4bf32ce9adf6e8bbdc SHA-256: eb29679f3fb0476cbf669b3d501e78dcd5d1d765045574fb94d905d8339a7070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://crewmak.ru/uplcv?utm_term=balanceo+de+ecuaciones+por+el+metodo+redox+ejemplos+resueltos PDF link annotation
    • https://total-sport.pl/img/upload/files/vozidofuniwosebab.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d66d9dd8b9---ririfuweje.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/44300759548.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea8414f2e3---2337696478.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/zifuxulus.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/cb5db61d9d98552e99b01c54b185ac90/zuvomokedetun.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/57368061461.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/77bsm4511ji00vs7lfb6p89oe3/88253114195.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a84ef0b4e220768076ec7a6ac5dd6f07/badatesimelubibixaruru.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/27221968673.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/97976954332.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32a5fbbdad---75696690573.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/94202032930.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/nibupoduveminud.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160852684dd0e8---83859319678.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a8a5cfa89fd604cca6871650f3a2a84e/58178388874.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b2ab45541---boxuzezejalizomodufuti.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/4684876515.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09805cb64---pipokinizid.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/kexoramewezew.pdfIn PDF document text
    • https://cli-kh.com/uploads//files/202108080950389238.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/d87b3d2af8eae351d728067ef22165b6/lewawafiv.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_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 11060 bytes
SHA-256: dfdc2e973592f6c1629b9e0027e34c362f0b886fd3b1783b2324ad7140d7f26b
font_01_sfnt_off00010d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 18220 bytes
SHA-256: 537a2d13604fd28b1b476d3195ac25d5806c235a0b3eefca63abcc55c95f885d

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