Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77e5034482c42d9…

MALICIOUS

PDF

78.1 KB Created: 2021-06-27 03:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82083969cfb298ebfb235e65da6d949f SHA-1: 9d2fe5a3b3e13b620c83471b45080be587bb4689 SHA-256: c77e5034482c42d962796be9855a6be2c037014e059629e2d66fe0973adeeed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that this document is designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://inwebjor.ru/uplcv?utm_term=is+a+hyena+a+dog+or+a+cat
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d85141416c0203780adab2e20a8d7ec8/69063244434.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/ouf6bkibnqrtfgb56p669bdtbq/filogi.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4eec575101---64645809602.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842fdf28e0---pibumasel.pdf
    • http://diamond6ranch.com/userfiles/file/5076658573.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13c879a435---senawiwidakozezo.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b81364ae801---41483735711.pdf
    • http://microsolder.hu/userfiles/files/forubokikovop.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/744238f524846807a71ab721b94beee4/85795398442.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/firaluk.pdf
    • https://acgroupenterprise.com/userfiles/file/fumumifekedut.pdf
    • http://rockhouseschool.com/rockhouse/uploads/files/nanubuxovagapabivokinixa.pdf
    • https://adasms.fr/userfiles/file/lilulezofixes.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/7c6c1b08f97edcc030c1e6f3f00d2e85/zugenapuso.pdf
    • http://www.asap-recruitment.net/upload/file/83990926672.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/waparebagenebonokerimi.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/d7a5c9edba05e9c34dac908a28b72137/28347212724.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/banagosukagozo.pdf
    • http://www.allatpatikapecs.hu/images/file/98649122254.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16091fd8a1c48c---zazupisawaliweka.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47d2b8bf3---lokigevozitejegusagedum.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b37fd7cede3---pusepowakubupepewededoju.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d1624a286dfca10f3410115e6657e3f9/31801210416.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_off0000cbd0.bin
3b739176aba617f7687f1536fc21153369380b022c22c9e1bda95b78d28d55fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 10576 bytes
font_01_sfnt_off0000e3bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 16792 bytes
font_02_sfnt_off0000fbcd.bin
5134f1dfed4cf81433e3243cb80f8184bd1de36b875cc0f230d62868f083a636
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCD 18756 bytes