Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e00c85596ddeac…

MALICIOUS

PDF

85.4 KB Created: 2021-08-06 03:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 69f6e0cbfcb20a41101398f31c8206be SHA-1: f1d2a44c76ecc12900398ef57b24a048b6c5e69f SHA-256: f8e00c85596ddeac5bae0cb592c65bd7efd6b20e74eb0f56c5e49121361e518c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs further supports a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=financial+statement+analysis+subramanyam+chapter+8+solutions PDF link annotation
    • http://thietbixanh.net/uploads/files/38385429114.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160856bda6202f---77000410327.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/polepikuxa.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090efd1c74dd---63115769142.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607d188de745c---pudexifubasizasubi.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/72880804145.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/daa6506356cc9069aba946c871d39d9b/82773055373.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/sogawizodolujaxazan.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2437bbfd0---13359573902.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/74633341704.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/nomep.pdfIn PDF document text
    • http://sharise.net/Uploadfiles/files/32463805292.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/xazejutepibu.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/67948086031.pdfIn PDF document text
    • http://magnachip.cn/userfiles/file/20210524104648.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/q81mpvdtaut2il5kdero3u3ei3/97512940585.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/37452888250.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/f1e25a266054f1d6707b500a6d44da54/pugowojaxupul.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/19870277745.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d471bd8fa---62659880955.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/31214764853.pdfIn PDF document text
    • 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_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 11180 bytes
SHA-256: 6957a2db29408594818eef1e6261b688a299094843109430141460fb5a48d6bf
font_01_sfnt_off000103cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 16668 bytes
SHA-256: 042daba804ad7b4a17c6ee7de8c40a23cb7128f6dde457451e27299dfcf8d8e3
font_02_sfnt_off00012f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1