Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a733d731dbff70…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 17:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1ea337b322ed0f4e9aedbd8560735b83 SHA-1: 46daeb83763864956bc274f05d79f9957cce3ac5 SHA-256: 80a733d731dbff70ce23c028995782954566de989ef6f16eb06c2b13c23c25aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The document also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious files or redirect users to phishing sites. The presence of these elements indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0bc11816cd41ba824317741d6f6b346c/dasanizima.pdf
    • http://condosworld.com/abisol1/userfiles/files/28697970944.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/588611786.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e4a80ff653d9e2552009c1172569374b/lupiboga.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/237eb85c694f94afaac60c166bfb1ca1/kumazudum.pdf
    • http://abwessex.com/uploads/files/ronedetasufasodufojuk.pdf
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/5ab1070867a1433ef1b6adccdae168ad/jejofadowufogakelovizol.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f4a92d7ed75fbfc568ed46457a035e8a/bopuz.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a74735f4189---befes.pdf
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/xadafumixulubitazip.pdf
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/14323794362.pdf
    • http://aircond.md/upload_fck/file/99608868409.pdf
    • http://kuresi-kaitori.com/upload/content_pic/files/16621779791.pdf
    • https://chaletsuenodesol.de/files/kilugi.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d585656f5c57e78ec63e5a68ce2a93c0/76789618673.pdf
    • https://flour.co.uk/ckfinder/userfiles/files/15556953819.pdf
    • https://bitree.ru/ckfinder/userfiles/files/junedekafaxowejivakife.pdf
    • http://rsst77.ru/upload/files/57062067643.pdf
    • http://giasuminhtam.com/Images_upload/files/28768804210.pdf
    • http://vejwun.cz/images/90662054866.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddd2a375f0---36245054457.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=structure+and+uses+of+phenol+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_off0000d170.bin
94b0d80eb0cd65a4184bfe90f40a26cd1a5a04f0a7276d673a42ddbf2b073c1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xD170 10800 bytes
font_01_sfnt_off0000ea40.bin
210855d101efa033f710c0bf4abc8c1394510da3d00f4c8a6cade61de9a765fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 18772 bytes
font_02_sfnt_off00011b7f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7F 16792 bytes