Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89f7aba493c21c6…

MALICIOUS

PDF

76.0 KB Created: 2021-09-05 08:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6008e748e051867e6d179d9982c4a497 SHA-1: 3d845322d9eb00e467b3a30d2ea964f9aff335a4 SHA-256: b89f7aba493c21c6bfde17d9aee8b12c5b7e8795215909975836e4debb05a7c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to websites hosted on compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised CMS upload storage suggests an attempt to obscure the true destination and leverage trusted domains for initial distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • 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 http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/b96aa146a75f3711193291cccbfb8ba3/66082929946.pdf In PDF document text
    • http://geodez.com/pliki/file/javujefe.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210729_200026.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/7702732352.pdfIn PDF document text
    • http://tinnaduraflex.com/uploads/files/zuzakuxowud.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a71a03ab5de7135694a52c88d5b75560/fikubiza.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/zulobujis.pdfIn PDF document text
    • http://huiking.cn/uploads/file/171154295517.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/88466863957.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/a5dfb2hom3mrmhjue15gtee219/lefetitomuvududom.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/44a39c9fdeb9117cb39616e9469aeb99/39334326290.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16123487966fae---jerudaxewafarawo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1000b1049---67640417835.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/morozejubelazave.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/00422b9c5bb8cdd3b261db1f187192d2/37516045457.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/digizuxosiwavabebu.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/popajogudajadeboluko.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/78460409327.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/88048746840.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ce856a38b56---55990830077.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/mafamikodu.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/zemaleboxe.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/voxitatefubidakem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=owners+manual+mercedes+sprinterPDF 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_off0000c575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC575 10764 bytes
SHA-256: b9634ed4ea42370f1ddc84a76978978ba713b8c771d0c35777b3066a41b76c7a
font_01_sfnt_off0000de4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4E 16860 bytes
SHA-256: fdbed546eb7a15251275b83e974de388c1a75a8fb9339abae45ffac4592ab1dd
font_02_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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