Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad10c7d813738d74…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 15:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 17598a85aeab6fd2c12e60926dae7c23 SHA-1: 024c80b92dd7ff84d76695b12f2f6363277e0b37 SHA-256: ad10c7d813738d748321acbc35d1aceaf80af85ec3c19f654e0f17eb1618970a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The presence of numerous links pointing to compromised CMS upload directories and disposable hosting suggests a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136a3c7e64a5---vakalomaporuteraju.pdf In PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/gipawudivipuzeji.pdfIn PDF document text
    • https://amgaa.org/temp/files/rupusajajomomelifu.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/pewamurorokapazisus.pdfIn PDF document text
    • http://getvisa.ru/images/File/remeditezijixedelu.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/13114545445.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161338b0cb0cbd---61087868185.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/xojunubamojenuveru.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/fereleboju.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/57538022374.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f6e553933502b846e9d693a762a3ae03/tuvobunifoxuramogutaki.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/getonutolomiwapitoxino.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/39c9c149db2e1dd7d77d8b5ecfed837e/80037602919.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/67183561877.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/lomovasulibutemujogo.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/15926142333.pdfIn PDF document text
    • http://dominant.name/userfiles/file/22957850395.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/8913049753.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/41931667581.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/4582672292.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/90419633654.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/jusimufajegobaso.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/10062273325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+among+usPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d32e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 17208 bytes
SHA-256: 874eb58505e606a8edb27fdb47ad03e505a674f423a20508abebf976472e5374
font_02_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 10356 bytes
SHA-256: 808dce849111ed9116db0a11d214f88278a332d850d3a26aa6f3d5a4c33053c1