Malicious PDF — malware analysis report

Static analysis result for SHA-256 0448f739e5ad9a79…

MALICIOUS

PDF

99.3 KB Created: 2021-06-26 13:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7204cd966820249eb459ef19b756e758 SHA-1: 19ce4b2428ae44694d544e66953b41c15cf402dd SHA-256: 0448f739e5ad9a791bc76de600f423fbf7a433778d088493932b1eeeaa4e14de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://krisoc.ru/uplcv?utm_term=cma+exam+questions+and+answers
    • https://soechi.id/userfiles/file/kegadevixupebe.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c601bc2c98---vekijodox.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/47ac3a4b42783474de25b4f3feeacd7a/jesidubuzaxiju.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089384272b3d---sunazugaserorigak.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835edab479f---vanoxologidapiletuboki.pdf
    • https://carparts-fixture.com/file/file/85809964229.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/aebc7cea2813c59b1ab806b75b51f1c4/19768229641.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a431706e0---88910071510.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607c604de3e84---90378897054.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e456d29f63---54029029256.pdf
    • http://modellszerviz.hu/userfiles/file/vezev.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/s0rraglf9pr8n7se95t9pmgdq9/43760073020.pdf
    • http://adabaskimerkezi.com/upload/file/54229208018.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896c2ed083c---84426416682.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/sredh6730ombkr1rsvket3q1jo/36322114825.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/557358736fc06610e5ee1ddeac1efde9/36083135114.pdf
    • http://barudan.hk/UploadFile/file/20210531200446241.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/bgid58tl242s06op6clrkocim7/wegujezuza.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607575d22dab6---93099494552.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607df62512b5e---kalexogivuxovewa.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/4h53c7te0h722jc4ga7s9pa0tf/zunosifu.pdf
    • http://i-daa-wl.de/userfiles/51763483255.pdf
    • http://stalmost.pl/userfiles/file/45678510998.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109b3.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109B3 16144 bytes
font_01_sfnt_off00011f32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F32 16792 bytes
font_02_sfnt_off00013744.bin
af12e93bbac0d5639dc35b7e763bb6838a0ba357d61bbe469737b0e49ef6fdc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13744 18144 bytes
font_03_sfnt_off000166a6.bin
700aca48689cee1e3ec9d4cd05f29a75c93b8542c2aaa7c42e434b4f5a3b427e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166A6 10828 bytes

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