Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c7346921dc6fad…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 18:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f1bdc5f3413c062aaf4072d94fda08e7 SHA-1: 72bf4edf5aed01fcfc39d579e691ffc8e4610e9b SHA-256: d2c7346921dc6fadd2f95d98717a054fdc32cfec77dafdd57196d9bcf516e063
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were extracted, the structure and URL patterns strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://west-holding.com/userfiles/file/pozabe.pdf In PDF document text
    • http://goldmustang.ru/files/files/99053266784.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/79eef704a09255449ce925fccd79570c/34907499573.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/fugebuzuzuzetudiniso.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/17338249144.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/komosamawobelepabisilu.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/pibapigulelojot.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/zitej.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/pefetamurugudij.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/d87b48jp1qih5t8fk3vmlcdtt4/19246285077.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/lesedodotabofepowetizi.pdfIn PDF document text
    • http://cpils.com/userfiles/file/xozixorazagujod.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/36269793420.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/7989ddcd0846f22ec71b66b643c3290c/65338019168.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/35238930908.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/vodunera.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/52414443204.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/biribala.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/23528466620.pdfIn PDF document text
    • https://lotte-ppta.net/beta/assets/file/79965250952.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/bajufatuxusixewuxifuxekuv.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140584917880---83645249910.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/28411693443.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/sogimafajutin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=calculate+the+average+atomic+mass+for+the+three+isotopes+of+siliconPDF 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_off0000cce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE9 17152 bytes
SHA-256: 2ebf2f8c26a0e54c0f53316337b0cfd67a4fe94bdbd6f35120aae91d753c7118
font_01_sfnt_off0000f9ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C5 11124 bytes
SHA-256: 2b11485a3e83d17f0ce10e4f1f82540d651fc69f93a076c9527ba0fc2c683de0

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