Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7815aae2764ab6d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-02 02:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef38a1dc7356b6cf27991629399ccea0 SHA-1: 4b00bdd747a5594ebee4471035a03b18b0b397a8 SHA-256: c7815aae2764ab6d45a03b932adb7adc1dc8c948f9c4aaab605821df3fca1d9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://allytemp.ru/uplcv?utm_term=action+and+state+of+being+verbs
    • http://hawks79.com/clients/85064/File/95056786540.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/ipa7e8e95i4qnrova602fv5s2p/xavasebiv.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a2942f972625728cd43a7e287795edc2/nebugevedud.pdf
    • http://akicgiyim.com/userfiles/file/66757596509.pdf
    • http://quick-thailand.com/images/uploads/file/zijopeseduv.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/ea5479713835e0dd94a81f4e4352d57f/92140881803.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d425c716926---88332640513.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa9c63d963---57849756537.pdf
    • https://seitonsolutions.com/ci/files/56428201770.pdf
    • http://filtrydokoparek.pl/img/all/mixarefokumoporosep.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b033fa8f62---taxijoxafogogisitudi.pdf
    • http://podlahyadvere.sk/editor_uploads/system/files/woriwakikajadevonawor.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/zadexigidomabiwalunu.pdf
    • https://vieclamday.com/userfiles/file/97021840533.pdf
    • https://ihotel2b.com/upfiles/editor/files/bajiguwebuwu.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10de76ffc---vavanonerutudo.pdf
    • https://almuhja.net/ckfinder/userfiles/files/fijijo.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/so7amj8fkaegfqanpfi6c98uuo/62052548720.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/35422463716.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9a6452e0c---26965726866.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/1c61c5656ce7033fd28d4945468a458c/49803823424.pdf
    • http://elsekmont.eu/userfiles/file/kokotofoloxagemo.pdf
    • http://chronocertif.com/userfiles/file/56416282918.pdf
    • http://a-swiss.com/upload/userfiles/file/doloxinodopodawum.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/sibipoza.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/40462207046.pdf
    • http://france-ex.com/images/blog//file/6969104357.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5c.bin
24d31fb675cebf45262d710bf1d892183b564da1488888ef160bab19db37e46e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5C 17720 bytes
font_01_sfnt_off00011d91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 16792 bytes
font_02_sfnt_off000135a8.bin
68d6370ffd49a632ce604c267f53bce7de42156627aadd9217eb3845dff81423
pdf-font-stream PDF embedded font (sfnt) at offset 0x135A8 10792 bytes