Malicious PDF — malware analysis report

Static analysis result for SHA-256 24fb71533723ed05…

MALICIOUS

PDF

94.1 KB Created: 2021-09-04 14:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2bc1e339a8c2dfeaf2cb50b0614e6d61 SHA-1: b65647aecde976e4b65e3a5a219aa516a0cb2b45 SHA-256: 24fb71533723ed0513ab036b56b85041b999c2eb3151b3703da61fba830de2ed
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting. These links likely serve as a link farm to redirect users to malicious content, potentially for phishing or to download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3423

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.
  • 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
  • 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://wastran.ru/uplcv?utm_term=editor+de+pdf+en+linea+gratuito PDF link annotation
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/1404602079.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/37741174419.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099569a63156---9567348609.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///77063776436.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/729ht1enolbs0549kojvtl10ec/34548227836.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/9742210416.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/ikvgmjpd1tg68e5isn7isnm93d/23133791882.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/pixuxuro.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/85536100337.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c1c99995d---84417072073.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/79453491464.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/16540251190.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2e71e86f0---gijobogumubejibi.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/titimusotokoduxumakamim.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/89570494403.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/77822290006.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abc64a20f21---30435366847.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/f7b58f58c562c9b8e26feb970184fe61/93215434199.pdfIn PDF document text
    • http://zlhk.ru/upload_picture/file/70809402561.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fobakumaresaxajiluput.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/47f0b13f550a7b2c7c93c1fd83d41412/45549053643.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/ranowerobunizo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 10588 bytes
SHA-256: eba8065cb419967efc4ac2ae062f2e8f637dd373af345a39bc40e59d1b70797b
font_01_sfnt_off0001580e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1