Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb183a189c8926e8…

MALICIOUS

PDF

73.3 KB Created: 2021-07-06 23:21:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04f26f46b61f488e3ba9b3c2f991336e SHA-1: 44f7a0009274c1f929077758a34580b4b78f0fe5 SHA-256: cb183a189c8926e8d373b5453e0d34e9298b589e54ce193cf4696496cabce89d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b16f13831a77fa2308f83a925c60fc53/24052132202.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/18f5b1cbfb5f9db512e3c4ff613d0797/72038681416.pdf
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/wefuki.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/avlta0alqhn2m5cnv9bq7tiang/83872558456.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160881da7276f5---munagupozazevuzuzorixo.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/f7fnuc0fh2oc6ms5ujjj6gk513/13061485358.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3d4efd7f---1700235063.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/40330739413.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/2pqv264t02parve26at7058pg7/wuvesuzaru.pdf
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071d11e86877---12095346576.pdf
    • https://ceccarbotosani.ro/userfiles/file/gugonogidapopi.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/94d012bbdbf4dbb5444c2ec21a3491de/dojavokise.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607807e2827d6---7649005518.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ceda6c76d---dakunulatubinakifin.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/njjstic7aa9057nt6anl5lmbu6/15498686245.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160994fa939c1b---mabuvo.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/28427380204.pdf
    • http://zabradli-znerezu.cz/userfiles/file/sosawer.pdf
    • http://kyanite.tv/userfiles/file/pupiwisujapo.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/844e56e5772a14c65544b2c3655b7413/gawovufof.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d816af41315b31b5e0877748fe0a58fc/musirob.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/kols76b65fn60eh0g84e5gsl54/pajavowanijololulosijo.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075c23dad8d8---58647024624.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16085c138170c5---lobubikobaxofuguredujom.pdf
    • http://roycraft.ca/userfiles/file/63712194529.pdf
    • http://mynigaoe.com/upload/file/20210527234142.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+print+two+pages+of+pdf+on+one+sheet
    • 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_off0000c024.bin
89cc02f562b353680a74ff0f7e5b9c95a469cff0260877a05bd774bbf95f9b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 10808 bytes
font_01_sfnt_off0000d8d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 16792 bytes
font_02_sfnt_off0000f0e6.bin
41d426e1920a4a9d13c9fe2f62ccf67916d891c9cf1866dbe50bae430906b3f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E6 15200 bytes

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