Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72fa8b874344499…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 03:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e9e8e76197feb022fa97bd9d963dc74 SHA-1: 9db2df2e5c9278fb886cb0c12a29275528534290 SHA-256: e72fa8b874344499965fa540dbc4780a2abdff2568983322a322c5ca3f3b961e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other PDF files. The presence of these links suggests an attempt to lure users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://andrejc.si/files/file/bokuzovakifavaxosoketikov.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073014ce613c---79695807197.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d2d3e446---vuvidadapotagomunoritin.pdf
    • http://ahlhy.com/uploads/file/291632528001.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607471c73e64a---wuminovuvozururiw.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084414de8926---nabitodivazupowi.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdad1caab51---xukibokibas.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6dd6a4d9a---zumufu.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8374b3d7ccdff310b862010b326c93af/66605016660.pdf
    • http://jpind.pl/userfiles/file/64476033949.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609210e2abfde---wilexadonorotiwawojab.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b92977039bb---17011156681.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071533a73baf---73793797599.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105261704049504.pdf
    • https://noriupapildu.lt/ckfinder/userfiles/files/sajegu.pdf
    • https://novzelandiya.ru/ckfinder/userfiles/files/24268064501.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a71dc3ec5---wutivarademajupanij.pdf
    • http://eltonltd.ru/sites/default/files/uploads/pojoralarinivowikak.pdf
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/6eedda28e8664856354cfe335b92a83c/2408428851.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/19e5b2f58274a391dc8001c6d47ad0e2/3943105650.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d78ec3d8f---15009847815.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hm9jiqh1ml698p3psgqnksr29g/futawaja.pdf
    • http://leaguengn.com/userfiles/file///moxamuvigajeje.pdf
    • http://standardamulet.com/files/files/61165071046.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/5e483944f04e7862a9210240dbeab715/4658616423.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=download+video+star+pro+for+android
    • 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_off0000f090.bin
52433e5197bee1e082afa19b4b13f017d0b29e928701e96e8fee928694219cf8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF090 17164 bytes
font_01_sfnt_off00011d65.bin
34b78d1e736d1edd9dd2cb8cded7169d4b094a7d93cccbaa07f50593dceb54f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D65 10644 bytes
font_02_sfnt_off000135ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135ED 16792 bytes