Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbb50996dd8af70f…

MALICIOUS

PDF

84.2 KB Created: 2021-08-26 23:04:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 97406f0b0b5fa4fd5eae9240bb74a384 SHA-1: 4ab1e3340a1b99c551a354b6ae45436fe2e058ec SHA-256: cbb50996dd8af70f201ddfc5c596c923473a6ba8c33d9922821a77b212bdfb54
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous embedded URLs, many hosted on disposable or compromised domains, supports the conclusion that this PDF is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e1211053e215d0f1e44e1f096628e2d5/sajotun.pdf
    • http://ebslang.net/_UploadFile/Images/file/likusija.pdf
    • http://prmakeup.com/Image/files/8420377740.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/zogivolikiseponojin.pdf
    • https://www.upperhousedev7.com/ckfinder/userfiles/files/43060213289.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608666fcd3de1---45461337144.pdf
    • http://eltonltd.ru/sites/default/files/uploads/64016162338.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ef6df07c---4791967991.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/krnhs8ddfg9144gq99tsskae20/liwopamoxefowowos.pdf
    • https://mnlex.it/file/dinapovaxanexogogoviwuzam.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d3573af0---68486034861.pdf
    • http://vpecargo.com/userfiles/file/vukur.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/fb3983c4ead4788973d4ae17f72af663/vororukubazivotajemilo.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9660173463---wofesilawoxo.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0a2b5936df78f78ebce5acc37f4c7527/xugupiban.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073da9c7045b---44460086766.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa86b2157b---48284157235.pdf
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/34498811061.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/af0b63e1746f67a9c7de867d2cc8e1b4/madogenunolixexa.pdf
    • https://commonwealthsportsawards.com/userfiles/file/kutavasaretimobofulepaja.pdf
    • https://cncunse.com/d/files/lozafopili.pdf
    • https://dintek.eu/uploads/file/navixibagakijimun.pdf
    • https://oklogistic.lv/upload/file/35463689444.pdf
    • http://thedewakohchang.com/image/upload/File/axexajosajovexezapar.pdf
    • http://wwstationery.com/files/file/39102120878.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b6c6cb698---bizewazorugijukawesapu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cover+letter+format+template
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE95F 16792 bytes
font_01_sfnt_off00010176.bin
7383b53f881ac53f0d4b12c93bc3a868a6cba7091e9e2f88c4509f1c4cfbbcfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 10252 bytes
font_02_sfnt_off00011898.bin
4e508c4b810e12ebcfd29a71f91897bfa2180f7a5d1f50d9fb55ea7a258b0004
pdf-font-stream PDF embedded font (sfnt) at offset 0x11898 16376 bytes