Malicious PDF — malware analysis report

Static analysis result for SHA-256 d374d582f0b37c70…

MALICIOUS

PDF

70.7 KB Created: 2021-10-03 22:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4f94e9f573f97994f5c8862185461fae SHA-1: c3bf690eef740023210cf8a43ba1b5d7358ec010 SHA-256: d374d582f0b37c70bd667c3863cb3bd2b1d5541937bee9957a88c6bb715afb22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm pointing to various external URLs. These URLs are likely used for phishing or to host further malicious content, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' firings. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://crysiq.ru/uplcv?utm_term=pdf+file+protection+password PDF link annotation
    • https://fototipia.hu/files/files/kubinitopekokakileges.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/jogifezukonesefuwakile.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/17399936462.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/tixafaxoxamomalopijeg.pdfIn PDF document text
    • http://yuilchem.com/userData/board/file/rivul.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/rikakakisefapim.pdfIn PDF document text
    • http://koreapyogo.puruemi.com/userData/affis_board/file/gavivokexijusebetezapoze.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/vevodisubitav.pdfIn PDF document text
    • http://cnfglgreat.netsociality.com/upload/files/942180414.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/ronaxaxuxowerosibax.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b11705aa05---72680800159.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/nezedefadatunibojo.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4f108c304ec863e44efc5ca664c7a102/26220290612.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/fopiralorapudonufabiz.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/40069197835.pdfIn PDF document text
    • https://led7.ru/file/fegogezilawada.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/93850248879.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/95832017252.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b441364f7---50168434766.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/3506574060.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161562ff84d63b---63024507271.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/sodazodizemofamu.pdfIn PDF document text
    • http://villaelen.it/userfiles/files/65847301724.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/16062306819.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/5b6699662ccd5647cab8aa17edc98f57/76423052311.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/vawufubutotezidadesideze.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_off0000b581.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB581 15348 bytes
SHA-256: e698a06072556eb96b7eca57a015b69a9b9526e3c955aa6851834ed2373c81dd
font_01_sfnt_off0000dc2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF442 10700 bytes
SHA-256: ce661590da6f651333e5e2375afd246e199c89633d5d9ef0abe48749b68dde35

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