Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dbe00a5358d2e9…

MALICIOUS

PDF

70.2 KB Created: 2021-09-13 12:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a55edb19a47499b569183225bb42f820 SHA-1: 0e6a1da4472def2f9851484c5e577f940b5d39ce SHA-256: 84dbe00a5358d2e942c0b7ad24cbb6990c4543aabb577e367b1139d4b33c7f3b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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 http://pokwuttibut.com/file_media/file_image/file/21985852513.pdf In PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/tobagarisanoluru.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/42795906654.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/fawedamezojagogete.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/ladeg.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/jodigizakepi.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/19453417711.pdfIn PDF document text
    • http://ipea.kr/userData/board/file/vazijexetudonisofarizaxol.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/litapavutikukux.pdfIn PDF document text
    • http://schokofontaenen.de/idata/vusokusedubu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b2a50606e---1218108987.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/wuxowegebepepixex.pdfIn PDF document text
    • http://eastwoodfamily.net/userimages/rafotekomegunamudakikiniv.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/54164966783.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/44835913430.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/12402693626.pdfIn PDF document text
    • https://pepsima.biz/files/file/65504119998.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6083ef48c---92283117348.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/timutisiv.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ummq2hpf5vpc5rjn0s6p1prvph/tawezedunesebav.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109041530457587.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/76030178583.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/voxel.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/jakabunurokabij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=craftsman+3+apkPDF link annotation
    • 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_off0000c5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 17936 bytes
SHA-256: ff233578d011912169d5561fe447891aaa5a061231ec48146060afddd637727f

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