Malicious PDF — malware analysis report

Static analysis result for SHA-256 7480fe8481fdcf24…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 09:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a94d331c8fdd7246db230291519be072 SHA-1: 92c64aff6bf501188618bfa35a2d263eebb6375b SHA-256: 7480fe8481fdcf2442651d0c4667f7d4059b1b5775040273b661c05aacf0351b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the document is part of a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • 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 https://rinducm1.com/contents/files/61119386647.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a954f486ae4---6166383307.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3c9338f7---85536609797.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/n5vt7qg0agmhqur6jaah5devr3/52473008142.pdf
    • http://coffee33.ru/archive/file/19009620548.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e85726242f---90176830448.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1f5b82f2861c1b2ba902de804a224cdb/68784882351.pdf
    • http://sincaremedicaltour.com/js/upload/fiwajovogefewif.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077673f7040f---vuribemaniki.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/15003679758.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/e0e97fc3037d474f496954adccb3d7cb/kimok.pdf
    • https://designclarf.it/file/7898667503.pdf
    • https://yssnewlessons.org/UserFilesTwo/file/gavozuguzazodulu.pdf
    • https://anukulagrotech.com/userfiles/file/bagewajawakajafagami.pdf
    • https://zhongzing.com/uploads//files/202108090443395989.pdf
    • https://congnghieptauthuyvietnam.vn/upload/files/mixaluwefugi.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/fec5f935e79fa49a2eb6fdd3eaf5da41/sedofuwovopererago.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8c75498174cd8314f7e3d76435e8d199/61091723516.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4996306d1f2228b1a55e586f8e6ecb0e/sebuk.pdf
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/708135551.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/58198cc0e7918d5362e32b92edb0d79e/kevojuluwununaxurezaso.pdf
    • http://flirdining.com/uploads/files/vivexowedovir.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=frenchton+puppies+cost
    • 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_off0000dfee.bin
c65bfddbc2a125607dc5791aff9786e03c0dcb1ce5729c0065a1daa866cfbda9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 17360 bytes
font_01_sfnt_off00010d10.bin
a000a8b5053da4a9a9387a83f3526aa87ad58fef572db7ed6125eeb6dda5ebc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D10 10340 bytes
font_02_sfnt_off00012450.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12450 16792 bytes