Malicious PDF — malware analysis report

Static analysis result for SHA-256 57db0be1a8d46289…

MALICIOUS

PDF

190.2 KB Created: 2021-09-05 10:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6b676601cd0a18fc1c018e8606fbbb0a SHA-1: 66b69f4adb20332ee3b657ae6fb39db4eb0d7fbe SHA-256: 57db0be1a8d46289e93348b6c983495c40e01f8972ccddc24a158810ae7c0b51
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns are consistent with phishing or malware delivery attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6578

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=grecon+dimter+opticut+104+manual PDF link annotation
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8fda173c2---68324300779.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/45962382781.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/jagufadunakipifed.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/34011607301.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f06ff0897a3---3359466722.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///taxitu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16125b06a5c5d7---tanimi.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/40910518703.pdfIn PDF document text
    • http://seatraderhk.com/userfiles/6426295156.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ipj2ld7ppb9rksof0b1a90fvfb/suzelofunar.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021070222204373499.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/fevojakiduxomivudofob.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/cd14e4f5ad2956901981d0b0c9de2d2d/18714988993.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/kijemotuz.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fcrsd7gfgmg742vgqe8nrkbg1j/lizotefafarijajefazugi.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/zewijide.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/91767978371.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/32195335771.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c6213c7fea2ef2d450414afdf7185daa/sedegamenak.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/xubunilemupibi.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/47984112630.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/77442761191.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/41884130519.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c79e2a41459---tuvobemuvasazewuvijip.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/zoruzepumanukel.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_off0002c227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002da38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DA38 17608 bytes
SHA-256: 7541a088a76842eeb200ce74e2fc64547483534a9a296de272b8ea4f7b847e37