Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4416fcc5977c66…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 12:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4626fac6e13e616f0aba11800b780183 SHA-1: 6da5a046e3cdcfb8cc60a254fc32b02527a00c36 SHA-256: 8a4416fcc5977c667bc5e44fc6963e4c095e8bcf79432865865896d7a9c0813f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links pointing to compromised CMS uploads and disposable hosting suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's likely designed to exploit vulnerabilities or deliver further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/3f5e7a9aa4ee17d080579fe6549bcb2c/lejiwumojuguw.pdf
    • http://youngthisyear.com/ckfinder/userfiles/files/tejuvusodit.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3r4jpefmacigus6up1gsmi2ctd/jexopogageg.pdf
    • https://zifu-tech.com/app/webroot/userfiles/files/45091687380.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/evfhkni8encrgrdcp7j0sskd01/35486923912.pdf
    • http://startent.ru/SITE/files/editor/file/lifusaxodetopa.pdf
    • https://riolospettacoli.it/filesUploads/file/basosofeba.pdf
    • http://marinda.ru/pics/images/file/newaximulotidarifuweno.pdf
    • https://attack.lt/images/files/95541273371.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b59e55003e8---xatozinomijuletalutiwe.pdf
    • http://packamate.com/userfiles/radagiruzudeboxo.pdf
    • http://korvet-sp.ru/userfiles/file/49900231690.pdf
    • http://www.vikingmaterials.com/img/zawurinixotajutujud.pdf
    • https://pottoka.info/files/galeria/files/sasegadafaxavixezenome.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609420bf3f9aa---33051169908.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/merupajumanaxugux.pdf
    • http://capesociety.ca/uploads/files/72075638311.pdf
    • http://waterlootour.com/FileData/ckfinder/files/20210812_2AE6466A8AC611B3.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6bf45759f46c81aa0ecf060573d2ec73/gezefafekubigawuzodedaper.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/eaa62690a376e48df9336b4ebd0b5768/bupekonadiwo.pdf
    • https://kingdom.vn/userfiles/file/zodemujugozip.pdf
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/xobibunojejoniferosete.pdf
    • https://cuatudongbinhduong.net/uploads/files/xedagazokudikagopera.pdf
    • http://myjobcareer.net/userfiles/file/2021083015071073499.pdf
    • https://hgb.se/filer/file/55951594121.pdf
    • https://bwawarszawa.pl/upload/file/xatokizig.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=shukla+yajurveda+madhyandina+samhita+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_off0000c8ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BA 16792 bytes
font_01_sfnt_off0000e0d1.bin
9cc9da2bf394246c02f5a7c57d5ec4e905b03532054e6df853c38f43812ff5b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D1 11220 bytes
font_02_sfnt_off0000faeb.bin
4b60ba968e1b30341d5f26532d599e30bf6e764152218b7977dbe432f82ee847
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEB 17428 bytes