Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d045a0e74b26ea…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 11:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 535b6bfa253cf3e5bb19cdcc42361ad0 SHA-1: 9f3b03764b7fd0b6cf5c4976e6e52ab3dba7c849 SHA-256: b9d045a0e74b26ea4c4abdd7498fb030279c447e55ea8146cf9730e7f33cfb02
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nslogisticservice.com/userfiles/files/fefifizon.pdf In PDF document text
    • https://hanomanberjaya.com/contents/files/40567990176.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/33523645711.pdfIn PDF document text
    • http://chinahanaro.com/userfiles/file///piwugolebolifominubijoxu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6aa34c95d---nixiroxiligamopogobimegi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138c13ed5a03---97263012084.pdfIn PDF document text
    • http://maremania.net/img_pagine/file/xifinelunenotafaguxebubi.pdfIn PDF document text
    • http://manu-transport.com/documents/file/25817845453.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/52228258815.pdfIn PDF document text
    • https://soechi.com/userfiles/file/fowizibakutozuxateruxadov.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/90039646721.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/rezozipisujulatorip.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/26294248230.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/45223084091.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e479aad8a---11899475310.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/tisakafupiboda.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/50026715102.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/devekubulikuzadet.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/fokewadekapowita.pdfIn PDF document text
    • http://orthopediedelft.eu/files/24089853616.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/87784827010.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/xenafis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fall+guys+game+iphonePDF 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_off0000b323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB323 10692 bytes
SHA-256: fd3ee3a991e615f637b172ad7f3c6a40e976926ed898db0301739f06b1cbc78d
font_01_sfnt_off0000cb6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6B 17028 bytes
SHA-256: c72753718c15250cfdd0bc7b775a6674acc5acebc284162212baf305b319978a
font_02_sfnt_off0000f774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1