Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce06de444b71e158…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 04:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5a747fc7fd2c0ffd639e07d27a1319b4 SHA-1: 6a95de8a90fd11e630f0c3c49a8144c5a35409a1 SHA-256: ce06de444b71e1584f5b8878ca23e754dbebc20cfdb9090a8c71b909fab8f3f7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains a link farm pointing to numerous disposable domains and compromised WordPress sites, likely intended to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it may leverage embedded JavaScript for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=when+you+send+cv+what+to+write
    • http://colorfusion.us/admin/images/file/30681977898.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c627b53ed---kemawovedagezuzareboxu.pdf
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/3f02a604f011a7d0d7676e70fe3f033b/35383280265.pdf
    • https://kodcomputers.ro/2664/uploads/lobenapenonumen.pdf
    • http://fernandopelosini.it/userfiles/files/ruvalonavevod.pdf
    • http://hnkingdee.cn/Files/file/202191455836.pdf
    • https://detskeihriska.eu/ckfinder/userfiles/files/fovelezetalizenezilorob.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c431b0b7bc---62266321385.pdf
    • https://www.studioline.ie/ckfinder/userfiles/files/domipemifodidazavebava.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/40752033cf10c6706f4ac2e6a7d68c29/gesewolob.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffbb2730fe---wavasuxiladaz.pdf
    • http://avandcie-energy.fr/ckfinder/userfiles/files/bukenapowavufoliridude.pdf
    • http://taiwan-casters.com/userfiles/file/64093210949.pdf
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/pigexutas.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/remeno.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436d2137e8c---wumisekodudoketedisax.pdf
    • https://shidoremicrosys.com/media/52536349670.pdf
    • http://pobierzplik.pl/uploads/files/41043185370.pdf
    • http://cgpreceptor.com/ckfinder/userfiles/files/97840768967.pdf
    • https://mr-alian.com/upload/ckfinder/files/bowuvaxuvulez.pdf
    • http://goldenpeak.it/userfiles/files/kamurukiv.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d95b63cb59---masutavasilaxapurokun.pdf
    • http://elandtour.com/FileData/ckfinder/files/20210904_99D08DF306B8A8E1.pdf
    • http://jrpst.pl/userfiles/file/xesovizi.pdf
    • http://usateatop.com/_upload/files/31524500249.pdf
    • http://tivatijapan.com/uploads/userfiles/file/52444423711.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f24b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF24B 16792 bytes
font_01_sfnt_off00010a62.bin
513f0387f1836506a881de14846f8718ce86c40c355d91579e977369542e4abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 10780 bytes

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