Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe9ea18f507a47d…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 14:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77ef04bf11531b779524071a4c74a77c SHA-1: 87e46c76367f8462bdcae8e76232b6e07c9a24e4 SHA-256: dfe9ea18f507a47df5d17798ab0bce7e404f00ab41b9b1b90d0284bb6a6c15c6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised websites and disposable domains, indicating a link farm designed to lure users to malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or malware distribution intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crysiq.ru/uplcv?utm_term=connective+tissue+loose+and+dense PDF link annotation
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3e035614dbe215c857077b3331ae15a0/lununudedipugitoxe.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/gixudipujilipepisizapuf.pdfIn PDF document text
    • https://primer-spb.ru/files/files/34569098223.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/59703233341.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210429105547146.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/89046569484.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/biwitezuvutugukufofega.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/geledudadulasufalupas.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de357f05f---vodowekazapetutaruduwanu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9a389676340f4cf5acd7950f4c38b59f/lorobidozifujodukidipo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/4e1a8343e08720fee955851cf02a314a/50719365419.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767c4ff0c4e---sagidesixat.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/36123702635.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb0d28e16---sogumawibusalevofized.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/vijedirafuxijovisizerejof.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/30637811615.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-08-24/50f341fc687f1fe7e729c791530a2526.pdfIn PDF document text
    • https://kaimano.it/file/21695714034.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/41701347554.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/bidit.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083211e0e9bb---kavewa.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/840bc6f68c748ef09deb44abe5490765/48215122030.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/torulu.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_off0000cb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 10460 bytes
SHA-256: 0974ad9d35fd49cefae875694b1bf70eddf3097027e84080ee3e6b62ae92dbcd
font_02_sfnt_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 16784 bytes
SHA-256: 591fcd45dd14aff1242c2d4d9e6352484683657ce58e964fd8e2571c0a3a5196

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