Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd1619bc3ef9379d…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 07:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: abfe163e4ee2bec4f6656b4994d8bade SHA-1: 23da7bac5c610392700e3be89f479565a93f99a3 SHA-256: bd1619bc3ef9379dcbbb508d190fc9db68bd6b73614ce42aceb6779c02718ded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure suggest an attempt to lure victims through a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://wic-net.com/userfiles/file/xovamuwiw.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/mezerumutizoz.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaefa8b566---nutopelavuxekapuka.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210908150115.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/87374853815.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/majagup.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/fifoxezebuk.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/95685296040.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/23029661850.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/zojenaruv.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161404ea924410---detiwusatolefuzovubevotir.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/11300365344.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/mikolinikufewerike.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/nogupamidok.pdfIn PDF document text
    • http://zatacorp.com/upload/files/35494629678.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/76606001403.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/66908093030.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/medevijovuzapotupimedon.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/31923344657.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/36613867796.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/16711043821.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/6379c417706cc0ff847cdbb5cf59f602/mufudipugawixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=gta+5+ios+appPDF 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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 17824 bytes
SHA-256: 740c705ab390e6032a82f53f1e79a3056ad206ce5b607cbc446317d919977556
font_01_sfnt_off000110fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12914 10036 bytes
SHA-256: 799a0735e0add478ccfd806a50944fa25912d6b6e7295c1213cba61fe121bda2