Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d9f8d2803aba55…

MALICIOUS

PDF

77.6 KB Created: 2021-07-04 08:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e920ff8eee594b1ba5eb244b731f8fd7 SHA-1: b523fc7cbc8b7e5954afdf649842237c7ea2de07 SHA-256: 73d9f8d2803aba55d2ba9f51aad3a6a02a2ec2757f773d125719bedccf9123fe
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised websites and IP addresses, suggesting a phishing or malware distribution lure. The file's structure and the presence of multiple external URIs indicate it's designed to redirect users to malicious content, likely exploiting a PDF vulnerability for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4dfc4693090cf7e753d62ee5556ed5e6/46879653720.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731e1cbb2f8---31831116490.pdf
    • http://bobiniauto.com/userfiles/file/gaxeboxozufikifukawir.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b454c85a8f9---sedulore.pdf
    • https://savitravel.ro/ckfinder/userfiles/files/kuwosofofevemorolubujote.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/6863ffd22e4b633f6b38e4ccc80e684e/6092672839.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6917b037---foxofukuk.pdf
    • http://udmvdpo.ru/images/files/33592787628.pdf
    • http://shengnabei.com/uploadfile/file///2021061322421331.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/banowabupafasefax.pdf
    • http://157.230.241.115/image/upload/File/11557732172.pdf
    • http://bmsorganica.com/userfiles/file/15876505787.pdf
    • http://famillespourstarlight.com/clients/a/a9/a9b42c05011d3bb27e7f7ec2ed30324f/File/pibozagimo.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/19667374517.pdf
    • http://pr-jam.com/ckfinder/userfiles/files/zoxewikuf.pdf
    • http://abc-tel.ru/data/File/dufador.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a24554c869c---70401230398.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2d61dda7f22edbbc992d32855b2a051f/taxupod.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16086f11f380cd---puxonu.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fbgj5eq6bd60lqesu5arqg7vk6/jivubipeses.pdf
    • http://greatnice.club/updatefiles/file/koxan.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/401a7a96a109e600ee397cf4edf9d5ce/wenujopepopukogumovep.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/rodurifijinepev.pdf
    • https://uleiuri.ro/userfiles/file/deniwokaninezovasuna.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/98ecb1e9fde249d17fa881622915e509/90714543388.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=creswell+2017+research+design+pdf
    • 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_off0000cb41.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 16792 bytes
font_01_sfnt_off0000e358.bin
df66d58c80f431cfac75737888d7fd90557f340de5266e8b3307d89a30d2ce0c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 11140 bytes
font_02_sfnt_off0000fd52.bin
f5807e01a23e18a5905917e31214d69f09c318c1671887d506574ecb8dba3d0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 16836 bytes