Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c898fca9cd42f8…

MALICIOUS

PDF

89.3 KB Created: 2021-07-08 20:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c676b0d992ce3a6797339b3345559d6 SHA-1: 11c477ae911331454f105abcfca1330fdfa7c6bb SHA-256: 27c898fca9cd42f830c83feead7126241bb2fda2a637ab548887768b2a59145b
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dgqbb5n9rp2jfcrptj1ca3ehb0/10664531981.pdf In PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/57049089873.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/k3ds16bpvah9jbbdt4l2nqi9ms/18619553971.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/4ec85a43ca29f0162ef922a2c124d5a7/raxudofes.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ddbace1567fd7cffd034de1f00757194/guvobijev.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45726f36ae---volijolutepirejebubuf.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/43598558824.pdfIn PDF document text
    • https://ottenburger.com/userfiles/file/tujobazabudikudedivivili.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210626_4D354B101DFE856B.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/41664308653.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/61571233194.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/fc904423f30c412d2b0b20b2191117db/definuzago.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/24168025971.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/dad69b12ae399a3143e513b566df5c6b/67012657344.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8f9katchf4dcfq8k6re63isq96/98810455323.pdfIn PDF document text
    • https://socohoteldanang.com/uploads/image/files/216650924.pdfIn PDF document text
    • http://nextgenship.net/upload/file/2021052616220623497.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/7388964875.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/jelfeolbie1vegnihtofpiakts/vewagesukobekebulepajoga.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/qk65pqleabl3b31d2j0joo1f5q/xibijijofirudev.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8572b8025---37574710174.pdfIn PDF document text
    • http://wrhsclassof82.com/clients/d/dd/dd94ad2327da436b0bfbe5937c3cc641/File/wasobo.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/7u1f1n5150qc6gjmem1atefnvu/22620011620.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/6827bdf2b3ad98adef4a039b14545dc3/nabuwositifapedodarirami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+california+state+universityPDF 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_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 17100 bytes
SHA-256: aa65cac44c3d3cf11c3a653ab39b29bc6e6082722df9a338688001c37229c1e7
font_02_sfnt_off00013dcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCB 10676 bytes
SHA-256: 23bd8e4dffecf7cf105cf77789810f1444bbbf93025ae8e2f624956befbc219e

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