Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ab6f16071f51d8…

MALICIOUS

PDF

72.6 KB Created: 2021-09-13 13:42:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 67cbe147d8cc18984b304e030be0cc84 SHA-1: 236a702a062ca8ed66c61c9f7e4b2b034d15228d SHA-256: f4ab6f16071f51d8756ff30e9bcfd86aaadee96c4285abfa2337af3c93326685
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://drafthe.ru/uplcv?utm_term=game+mod+apk+ios
    • http://epoch-making.jp/js/upload/files/vekure.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161364ab78c693---78053731741.pdf
    • http://autowagon.it/userfiles/files/wosaj.pdf
    • http://fishtech.org/uploads/userfiles/file/file/46722180055.pdf
    • http://sfipl.in/userfiles/file/vibanulorevupipu.pdf
    • http://sissonne.hu/editor_up/74183386280.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ptnoavim7jqu7k498utgv9psi5/daziparunixiwoziluzaw.pdf
    • http://constantemails.com/userfiles/file/1631360255dilusoxev.pdf
    • http://studio5r.com/userfiles/files/80635611010.pdf
    • http://biolabsrl.org/userfiles/files/15074785894.pdf
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/kukuxe.pdf
    • https://sukienmiennam.com/userupload/files/xokodizonenadojowudojetu.pdf
    • http://smalternatywa.pl/media/upload/files/4cb36f0abdc8de38fcd805c01744b9d9.pdf
    • https://sergiomauri.com/images/file/99655064666.pdf
    • http://oilspecchem.com/files/sekupoja.pdf
    • http://hhoasis.org/app/webroot/img/fck/file/fefafezoxezuj.pdf
    • http://dintainoodle.com/uploads/files/fijezotawon.pdf
    • https://vidaleve.net/ckfinder/userfiles/files/30262715631.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b07bba76a2---13391036460.pdf
    • http://www.gesas.it/media/mailinglist/file/33309375238.pdf
    • https://themalc.org/files/file/30415897992.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16131d717a9bc9---60450239949.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_off0000ba51.bin
ade1cd34da0f37e787f2f04e65554c5642e0e6acf6844ff2d52eb23f6d7608df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA51 16956 bytes
font_01_sfnt_off0000e57b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE57B 16792 bytes
font_02_sfnt_off0000fd92.bin
d55e96828ae87121a28f60f31aa40b7aed21c0de5a265fa1d6becdc7ed0b25b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 10336 bytes

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