Malicious PDF — malware analysis report

Static analysis result for SHA-256 373de67845cf3fa7…

MALICIOUS

PDF

100.1 KB Created: 2021-08-05 05:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44076639e9b4c2990fa82ded04bcd9f8 SHA-1: 31a2b94a689df2292459daea1cd5708b7398ae70 SHA-256: 373de67845cf3fa79605ffe9aece173c2beb53f06375270cd0663aeff727bdb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure itself is the attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://lionkingbali.com/uploads/file/83635003178.pdf
    • https://prairieroseclothiers.com/FCKeditor/file/68725546605.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c09b5bac2a4---71345979538.pdf
    • http://debseven.net/UserFiles/File/17444983611.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16259147955331.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5077c1503---30936943094.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/69870ba4acc697f9d04d4915fec411cf/sufimofitodajapevufotivi.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1f3c22760---80080754758.pdf
    • http://aarogyamedico.com/userfiles/file/bamijutupusivemut.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6aq930q4ns2t3iuib6aa1i6dg4/fomofegaw.pdf
    • https://rakowka.pl/userfiles/file/2027634583.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbccbecc86---8137544923.pdf
    • https://audit-advisers.com/userfiles/file/72622476475.pdf
    • https://podiummagazinenews.com/ckfinder/userfiles/files/23867174081.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8339969dd---bokonimokuvozopubukep.pdf
    • http://autodilykanka.cz/cmsimple/images/file/64714284515.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989fec439ba---pelotu.pdf
    • http://daotaonhaccong.com/uploads/userfiles/file/2960409166.pdf
    • http://businessvaluationapp.com//fck_files/file/44701203645.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b346773600---datelojopekegi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=sacred+geometry+drawing+tutorial
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ce2.bin
ec25a194e58310d4b4f8f98b65ed61dd143b4b8be5e3a8acd4a17d0e900953be
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 16172 bytes
font_01_sfnt_off0001227c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1227C 16792 bytes
font_02_sfnt_off00013a8e.bin
c31da57bf4abbe5f160243b0d4ea2219b904424c27df50b9c728ef2a0e2ee77c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8E 18472 bytes
font_03_sfnt_off00016970.bin
7431f73e9f46bfb9d6cdbb057ac0ee88dc53171c10f2890379f722ccc533ab3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x16970 10920 bytes