Malicious PDF — malware analysis report

Static analysis result for SHA-256 fda70074bd28efe7…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 23:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c223eb826f41c27b21484036a77acf46 SHA-1: e9e90057823e43fffde531450a9c65cd46a62ff9 SHA-256: fda70074bd28efe78359d84e17b6f8c4241389dedf9e82a6485262216a2b6a95
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' specifically indicates links to compromised WordPress upload storage, suggesting a potential distribution point for further malicious content. The presence of external URIs and link farms strongly suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=qualitative+theme+analysis PDF link annotation
    • http://terwaarde.be/ckfinder/userfiles/files/mozadurukuworixuwem.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/85992313970.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/lukekiwoxawivob.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/letizefotipilab.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21653a594---putin.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/fimixo.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/92788863429.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/70719138442.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/82148048696.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/ec966193ef35fe6b6f1c1ce718abbd79/34942823714.pdfIn PDF document text
    • http://skisun.it/userfiles/files/13473285385.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130678a56526---94737762729.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/pivigosudedosup.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/galavumatafuj.pdfIn PDF document text
    • http://siamsankyo.com/Uploads/file/kafedenetebat.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/50771886630.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/xotusafijinakuwukeduv.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/56810031543.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16139bc855a7ea---9119641486.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/4566025272.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/zemefonuji.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/12988748575.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/52093531517.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/soboxepezubiladiwo.pdfIn PDF document text
    • http://dissanna.com/temp/fckeditor/file/xokowikafitigamudu.pdfIn PDF document text
    • 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_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 17440 bytes
SHA-256: de869ff929c71b78d0e10caf27c4da5227dbf597c8c3e5c6a3df2cdb9fd8db95
font_01_sfnt_off00010e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E92 10492 bytes
SHA-256: e03823b49fb043763415489199f9ec2e9ace81969134c418356a5b71ed65a017
font_02_sfnt_off0001265d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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