Malicious PDF — malware analysis report

Static analysis result for SHA-256 63197bad7ded3648…

MALICIOUS

PDF

88.7 KB Created: 2021-09-04 11:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cd044ff5d189b02dc396b9a7bde632b SHA-1: 42400b46593f8cee31840cbd4565d41294b76bce SHA-256: 63197bad7ded36485dbb769f0239ab5167fbfa23f32feee0b6a0bcad82b32220
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were directly extracted, the structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7687

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 http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160813520f3ffe---64582457813.pdf In PDF document text
    • http://alfadent-volg.ru/images_uploads/files/87417766363.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/xixuzeb.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a30c34d6be0---92420239492.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089387cced0e---15953189216.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/lefamixej.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/dobegalamolatulamidal.pdfIn PDF document text
    • http://jcaf.or.kr/ckfinder/userfiles/files/57388543774.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098152911e68---41791313039.pdfIn PDF document text
    • https://t2sc.me/userfiles/moronegivowu.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/22651535041.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607392de0a23c---41353574475.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/50358321393.pdfIn PDF document text
    • https://mfdesign.hu/files/file/vitet.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/12958184416.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/zetixebemidawunajabifo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/510f93f3de54c2cbc1608440937c513b/tuwisorisumipi.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/parewigi.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/44c38b70eb811ba7a8e698ef3c9f2546/46441289123.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/kezojivesudumunurag.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/c7eeb67a9c470b5cd7b29dc893910fd3/xegug.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/4e0e36d429a1ebc78643db888538b642/97746515978.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/pimemiva.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/d6e8520a96c9a65e3f523f07ac63fa0d/lojawufedunatuxetomuwi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=displacement+power+factor+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 10868 bytes
SHA-256: 5dee9f76917909b9af7fd51b05cabdc98b7c2398cb6feb05990f513f89901177
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 16196 bytes
SHA-256: eba26e8fbb431b7e50dd6079aeb1c9419622604e15d0f91ceec9e2a9f5a1ac62
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_03_sfnt_off0001165d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165D 25452 bytes
SHA-256: 0e5f50d3c786d30e51ce4e2b2db5d83816ba5dac6ee69a5dadf32bd95f358336