Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bc3a4f80e28fd6…

MALICIOUS

PDF

108.6 KB Created: 2021-06-30 17:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6657687379bb766190b1a70a43823fe SHA-1: 2f376a369a259505712f1c58de8aea236d2457ec SHA-256: 48bc3a4f80e28fd6cbac3a51cadd0e23cecc81d1193febde7ff9eaaac87f9358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload directories and other suspicious domains, likely for phishing or malware distribution. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=minecraft+how+to+build+mob+grinder
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c6bc40c52---vuvevomusomoredamifavipo.pdf
    • http://cristal-in.fr/userfiles/file/14707636707.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32baaa82e---48428122878.pdf
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/7hjogun6dst0v6nk1v2bk707l7/22024682940.pdf
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3543d0f21c959286ad5cb21b7ff27453/fenigizinizopu.pdf
    • http://akcjonariusz.com/UserFiles/file/sepuzowegu.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d45e0491d---wowizezuvekajegumafo.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9797b6d5a---89515147181.pdf
    • https://mlmrockstars.com/ckfinder/userfiles/files/kevarupigubiferexoba.pdf
    • http://pnmanagementsolutions.in/uploads/zegirofifumakunojuzu.pdf
    • http://aelma.com/sites/default/userfiles/file/41112433653.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea70e668e4---15290447348.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/186381fdbf09aef7c2e94bfe49e87d56/vodifozigumebu.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/ad9a91f8dc86e5da36864877a66e44a4/93081602581.pdf
    • http://assessmentinsight.com/ckfinder/userfiles/files/fivedafodubiweboletuz.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc5195f5b9---83114697475.pdf
    • http://caigeshi.com/uploadfile/file/2021060111135473499.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/28d1cdd8a45b0e295c997e386f6a9f26/fedawi.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090bcaa9a2d7---legapaxokukavure.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078987dd0d5c---pivojedajevazamaziketag.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb18dba9b8---jaregazil.pdf
    • http://arredamentoambienti.it/img/file/83717045490.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_off000146bf.bin
b085e1a0eaa00f0ffd36db3af6fdc2012c56d09bdc97acbe20e39a4d3788555c
pdf-font-stream PDF embedded font (sfnt) at offset 0x146BF 17172 bytes
font_01_sfnt_off000173aa.bin
a9652f598095fd811b6a3cb7466c967ecc0cf437be31455e8475d7d4095bc726
pdf-font-stream PDF embedded font (sfnt) at offset 0x173AA 11076 bytes
font_02_sfnt_off00018d1b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18D1B 16792 bytes