Malicious PDF — malware analysis report

Static analysis result for SHA-256 129c37ef93eedef2…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 04:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 732c3fd911d6de3c6387865c838a225d SHA-1: 6f2b4404b4aece6d9fc31801266e6e9fa97ea147 SHA-256: 129c37ef93eedef2a0a654bbeae2bccbbe8565fe2ec98589b65d5c23dc3b2b8a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the 'utm_term' parameter in one URL suggest an attempt to track user engagement with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=octopus+game+apk PDF link annotation
    • http://murielbellhomes.com/userfiles/files/66377031141.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/10691627542.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/14491332248.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/kakukemawigujosaluvinamas.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161433dc4f30c1---xalisopozariwomo.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c98f26c3bebaa043caa523afe9961e13/mufatekigimulawewa.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/5419710626.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcca75c29c---47875703645.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/dudibubireguxegatakemag.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/pezokidebolofe.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/lizorenesunuve.pdfIn PDF document text
    • https://finliz.lt/i/File/kogulavafoxofimema.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8a27e35q9tc6i7gf555vnqrcv1/87547018570.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140e308abf2d---rejeturavuz.pdfIn PDF document text
    • https://sentralperdana.com/file/98516345171.pdfIn PDF document text
    • http://tl-maskinfabrik.dk/userfiles/file/meziwudu.pdfIn PDF document text
    • http://palami.by/images/file/67000310450.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/kipojemej.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/qd1v41tk2igun5qfv3slcu2sqp/47996889182.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f1241855b---4838271441.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139299733500---31920875790.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210915182149.pdfIn PDF document text
    • http://bwemfjhjk.friend-match.com/upload/files/zinisotugala.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109131649023392.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/pulosibenejijateju.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/58730918447.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_off0000d987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 16972 bytes
SHA-256: 59a8827ee9e512ca871016df6d1f5d50ad8fa35c2e7a51ff21e0c1432a0236d6
font_02_sfnt_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 10592 bytes
SHA-256: 5aff0f25529954989f56dbedf6f5f9f9fb8cf105c1332ed0ae45c7e143a8ad28