Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0bda274f6c7ac2…

MALICIOUS

PDF

67.3 KB Created: 2021-09-25 23:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de0900d729817f5f620f22fe1f6558c2 SHA-1: 1225a60bb50cfe8d31ce0a359eadcdc79a90dced SHA-256: aa0bda274f6c7ac2b11d302d36fdacab8755f48055735e8aa6ad1b252f9df8f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also features a link farm with numerous external URIs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code, likely to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://eseninternational.com/uploads/files/48152351028.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3ab4cb3f5d8331a004ffdf5ec80d4278/60052345547.pdf
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/gitamefuwiwemogidozof.pdf
    • https://tonicsuitemusic.com/userfiles/files/dakul.pdf
    • https://hainutedecopii.eu/ckfinder/userfiles/files/lijumodopegi.pdf
    • http://intertermo.nl/userfiles/file/29939397054.pdf
    • http://www.sosonomo.com/ckfinder/userfiles/files/88956638209.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/tp4uldfbejtk9gqonmpfiq102g/polemutitexujabepepobima.pdf
    • http://safaraval.com/basefile/safaravalcom/files/14015637355.pdf
    • https://ketex.com/trcgp/ckfinder/userfiles/files/nogixexa.pdf
    • http://myphamasia.net/upload/files/36753072824.pdf
    • http://diegogenna.it/userfiles/files/41561902093.pdf
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/kipilefigobov.pdf
    • http://due.pt/js/ckfinder/userfiles/files/xezilat.pdf
    • https://dichvumayphoto.vn/webroot/img/files/73685370046.pdf
    • https://granitabrasive.com/editor_up/37048609382.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/pdb401jpf6u35vnq4v33idd8a3/xefosaj.pdf
    • http://electric-kernbichler.at/wufenasuliwifuf.pdf
    • http://geometracosentino.com/userfiles/files/72035539028.pdf
    • http://solar-makernavi.com/ckfinder/userfiles/files/45704684645.pdf
    • http://rc-modeller.se/images/file///gegaxezilijimapirukog.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=digital+wellbeing+%26+parental+controls
    • 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_off0000ac04.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC04 16792 bytes
font_01_sfnt_off0000c416.bin
f51e4543d747340314aa2026ef2b614ed32b38b6033733c6bd03404d69daa503		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC416 15268 bytes
font_02_sfnt_off0000e9bb.bin
bf3c51c07f4ffba2157876bebc780c1d6c9f9c4c89b27fb7f5e0596c0318f8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BB 10124 bytes

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