Malicious PDF — malware analysis report

Static analysis result for SHA-256 339d35230c9a604e…

MALICIOUS

PDF

96.2 KB Created: 2021-09-18 21:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dde191d5c1912fff88cd62db4960cd48 SHA-1: 09521cf5e253220a4b5939813654559d8c1f7c0e SHA-256: 339d35230c9a604e5a54cd31ecea5139e62e620d97fd2cd8ead9afa82035d842
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9761

Heuristics 6

  • 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.
  • 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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c991341eeab986464381dd3b06338970/14079230602.pdf
    • https://hoatuoi360.vn/uploads/files/vimitir.pdf
    • http://adice-area.com/pictures/files/43194162519.pdf
    • https://sieuthigo.vn/upload/ck/files/27481266872.pdf
    • https://pavillonwohlen.ch/userfiles/files/vobituvugijufopizotirafi.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/wedaloxewexedujupekimu.pdf
    • http://actinq.nl/upload/file/kakon.pdf
    • https://catequesisnavarra.org/guiarte_userfiles/files/nilutibovugi.pdf
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/93160749052.pdf
    • https://quangcaowebsite.vn/uploads/files/kijopojuj.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614594a068820---32789343620.pdf
    • http://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/40229784420.pdf
    • https://horkolas-gatlas.hu/ufiles/file/kamitemode.pdf
    • http://ztracenaexistence.cz/files/content/file/27085083162.pdf
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/kunudomoju.pdf
    • https://t2sc.me/userfiles/dibisanabebuxufimir.pdf
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/43502029378.pdf
    • https://hediyelikhanem.com/calisma2/files/uploads/2596552583.pdf
    • https://mkontakt.pl/dat/file/lutajobiba.pdf
    • http://studioingtassinari.eu/userfiles/files/95483035160.pdf
    • http://www.serenissimaservizi.com/files/fevagobexuwoz.pdf
    • http://malopolskiszlakwinny.pl/upload/File/rumuzisig.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d7dcf4d0---jakazonepunatabosefafek.pdf
    • http://sipzip.com/userfiles/file/14651870259.pdf
    • http://auto-rad.pl/userfiles/file/juben.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a523a474---rigune.pdf
    • https://mcdelandes.ca/uploads/file/vuruporanabu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=ruler+camera+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84e.bin
9fce5bad30ee14455297d31b81879bd1c20ff72dc03dfef59d5df0543295899d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF84E 10412 bytes
font_01_sfnt_off00010fc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 16792 bytes
font_02_sfnt_off000127d6.bin
b44e304f4199d162c520aa61e4565b27969aa952fa2ee1db3f4cf671ae1a9eb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D6 1868 bytes
font_03_sfnt_off00013089.bin
2fc255e35969f03a69ea77a5adf2a570bf85c5b11f96c33512f23d4ef6e667b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x13089 25888 bytes