Malicious PDF — malware analysis report

Static analysis result for SHA-256 0333160371636728…

MALICIOUS

PDF

81.3 KB Created: 2021-09-06 04:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c54f6faec0a718dc31f9e402ae4d2b0a SHA-1: 8645bafbb3dc548461b874ddad943cb088c6a29c SHA-256: 0333160371636728bfcc3cfc8ad54dd5cb139bb84a566848cde7432d55050d24
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, which in turn host other PDFs. This suggests a phishing or malware distribution campaign where the initial PDF serves as a lure to further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://assignmentmart.com/ckfinder/userfiles/files/20210052727.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/129825c0caa9e1f064bf541075f85e0d/xufukisedobito.pdf
    • https://cahayaapi1.com/contents//files/faxosedutenovos.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b275b9be01e3eba66a3bfccdc4f77305/68876746092.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b910216bb59---bigov.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a322b972b2f---91894606494.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5deefe55e4f6074d46ce274722f2d458/18645529521.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609074d02d969---1915755237.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/293d3e2cd80da8bc41ab6a186dc7df9e/87817746848.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073763587829---11190508674.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/bpa3hl6niqa13np1bjl83dsepi/saxeloku.pdf
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210610_BC216B948D7DD819.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/5mpjmq01nh8c2vump0moo071mr/70089217024.pdf
    • http://gsemilia.it/userfiles/files/24540315926.pdf
    • https://www.edm-medical.net/ckfinder/userfiles/files/rugavowon.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/37a00f65200660bbb7a9430b75ba9dba/47286256051.pdf
    • https://elitstroycraft.ru/source/file/77742354347.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c73567dfc6---4757820819.pdf
    • https://ka-base.no/images_content/file/gorutizixufivekuze.pdf
    • https://viboot.com/ckfinder/userfiles/files/16550552845.pdf
    • http://studiobardinisrl.com/userfiles/files/38669635627.pdf
    • http://sushigonewildtogo.com/uploads/files/zazej.pdf
    • https://fainitelecommunication.com/public/editorfiles/file/12546849362.pdf
    • http://charontrade.hu/data/file/68259952067.pdf
    • http://holzbau-napetschnig.at/zunavug.pdf
    • http://eot.mn/uploads/userfiles/files/14325640564.pdf
    • http://thongthien.vn/upload/files/33427112028.pdf
    • https://termofriz.rs//files/najagilufifav.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ford+ranger+xlt+2015+owners+manual
    • 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_off0000db9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9D 16792 bytes
font_01_sfnt_off0000f3af.bin
65fcfa5265538b2405b5f01d40f2f2a075a2346c0d79a6e384fe24976a8f8d39
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 16152 bytes
font_02_sfnt_off00011d85.bin
1979a68de8cc65c0032c2ccc0d74409543f69db5c45cb6f13ae31b4e8e4d738a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D85 11192 bytes