Malicious PDF — malware analysis report

Static analysis result for SHA-256 953bf5a74fc1fe55…

MALICIOUS

PDF

76.4 KB Created: 2021-08-15 09:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5b5a7de5e62bf848b4ce7822024b9f8f SHA-1: 02859e931203428a317c98d5e67a01d20ac6520f SHA-256: 953bf5a74fc1fe556ca8f7be7c775fda592b961a78f4779af0d298a33fd2dccd
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware distribution sites. The presence of multiple external URIs and link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://oniceh.ru/uplcv?utm_term=tanaj+interlineal+hebreo-espa%C3%B1ol+pdf PDF link annotation
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/fad495a477b8f3f5d792f53b89fd5e17/49002074226.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/b126c90e260bf3be7bce5a4708324520/sasapakefanuk.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/14083100463.pdfIn PDF document text
    • http://adveotec.com/img/file/98007678776.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/fajikara.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e546d681---bafaleluna.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98be35cb40---92970044086.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/75127718e8945e44bf3400070467dd16/77567494855.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/48696232080.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/kajimekoloxe.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/nobogepatelifijabok.pdfIn PDF document text
    • https://mollis.rs//files/pipupo.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/70933352438.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mejeadf65enik9ie8jj4742blc/42627278760.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074b4417f3e0---pejukanetiroravugaf.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/37459108766.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210620_5D22F202F0EE43F5.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/98447283986.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e4708e328---45261405844.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/sugulejazalomesosalaxiraj.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/tidosuma.pdfIn PDF document text
    • http://aven.su/userfiles/file/92135789067.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_off0000c49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB1 11068 bytes
SHA-256: 0342946f8878687ccb5938659d3e0df12539dbca7e6265f13d26dc987c34a604
font_02_sfnt_off0000f5ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EA 17100 bytes
SHA-256: f08efc9783d0eae93713e1abfb3c3577e073b20c7afd5ddc574124b717cfe229