Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5e8c1f1698157d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 23:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07bb8e5673fed9006ac73e5c92e9c113 SHA-1: 5e7146050e2ed6666137f0be50ab42d4e0185345 SHA-256: 7a5e8c1f1698157d53640a0eb73c357df92e755c51f2aca8b69ab47771d85d60
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves directing users to potentially malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://sassanoproperties.com/FCKeditor/file/mexawateb.pdf In PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/65165610431.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/wasuroxu.pdfIn PDF document text
    • https://estoniapools.com/contents/files/85756864215.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/94488791130.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/nelebitaxitorireguxa.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/mobitagipozejevi.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/99662226898.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/54069837365.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/45544025792.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/bepefesikiwexuja.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/43780625456.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/wopom.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/jukawazizufad.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/mojoxa.pdfIn PDF document text
    • http://didopack.com/files/zimefugaxojomupeva.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613175ff33114---sofanabawixatowoner.pdfIn PDF document text
    • http://shangrilatheshow.com/ckfinder/userfiles/files/dovanojixapawi.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/79896194027.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/dafav.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/83664072584.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f50ad5858---xogerazeparito.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/52507990048.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e02653a5aa54a131fe96d92cce943c6b/51642597498.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/batosudejanowe.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/20966529665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hidden+notifications+androidPDF 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_off0000e17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 10416 bytes
SHA-256: 83d9c7e388f2418056004e88d2f6a0ceffe40be5c81caa7c84758d3eeb7b2ef2
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 17840 bytes
SHA-256: 77c8dc0b1d7343c3ca08e0872ca50d6a15214d0d8cde4885e92e1d89958782a1
font_02_sfnt_off00012739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12739 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1