Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eaaeb381778943a…

MALICIOUS

PDF

82.0 KB Created: 2021-06-20 18:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 3910660ab423ed3838459b068603d98d SHA-1: b6a09ca5f74be86f638f9dc150bf9ddc8a1dc75f SHA-256: 5eaaeb381778943a11c537b26420f3a1a23cc961a505a67af79a8af2e16aaf1f
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF link farm heuristics suggests a deliberate effort to create a network of redirecting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://irlanc.ru/uplcv?utm_term=nioh+2+best+katana PDF link annotation
    • https://xenang-mitsubishi.com/fckupload/file/94794050390.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff8eba5e19---zuniworegerulidazifatu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/ripuwok.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce7e64152e---90657682953.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0794047f7---63238869751.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/zupezuxuxijitiwasafamaxu.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/41898669442.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd0be3840---66304990750.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/gijejigopede.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/90200133329.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/qn0jilhmcrfdp43e3t13cabfhj/523835381.pdfIn PDF document text
    • https://coil.hk/upload/files/50114020830.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080b4102c1ec---86236821288.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b252e57b64f---97959380487.pdfIn PDF document text
    • https://chp-travel.ir/data/file/toleberuxenogawile.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ltdcd7h7u6q7e4nmj955coppro/niriguponotuz.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/60168672857.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/kisovamenewokukaxaxej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 4952 bytes
SHA-256: 932b1e0d866b4cd69dc655d62caa7bc0e8cbf55add20a536a26d191b7f39b636
font_01_sfnt_off000115f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F5 11152 bytes
SHA-256: 7660923a5c98239e93fd7387c99c6ffe9ce22002fdae116f9cef4ebf2fa718d1