Malicious PDF — malware analysis report

Static analysis result for SHA-256 9141b5799fc303c1…

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 16:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de1d246b2a04fc4641880be0fcee5823 SHA-1: e96c937624a10e5c6d0f252ca049631ad786cca4 SHA-256: 9141b5799fc303c1e066dd1a53e7787f8717d4aa1439e91774a1bc91d4d2c9a8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The presence of 'LOLBin token sequence' and embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or to download further payloads. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://medvor.ru/uplcv?utm_term=kirchhoff+law+of+radiation+pdf PDF link annotation
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/67063828830.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/juterofabuserebagijafola.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/14447200329.pdfIn PDF document text
    • http://ridendo.cz/files/file/92453934494.pdfIn PDF document text
    • https://bloc-immo.com/images/zasokujazapuvulaw.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/9908303319.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed136668f58da89943d2addb760b0f20/soborufof.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/nataxitunixijavojukikob.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/gagelodiguxomopepukizufew.pdfIn PDF document text
    • https://cristalensi.com/public/File/77313256267.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tamiluzarugudakozakodanu.pdfIn PDF document text
    • http://zonwering-belgie.nl/ckfinder/userfiles/files/tunod.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/vapifiruj.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/00a6fbc1c58429bae4179e4a1cba2e9f/32947184104.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/vopapijo.pdfIn PDF document text
    • http://qdcmd.com/data/files/86163951185.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/rewideno.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fde28ce13---34566197141.pdfIn macro / runtime command snippet
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103027bcf064---2548527720.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/nezebasikudeva.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/91642678521.pdfIn PDF document text
    • http://fabtur.ru/upload/files/gawubagosoma.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/bovet.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/bidejuluvilelepefe.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d644e818---xatefajafulipe.pdfIn PDF document text
    • http://busanpc1.com/uploaIn macro / runtime command snippet
    • 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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 19396 bytes
SHA-256: c0b1649dfc8fb284cb01eb040a03963a48122485a70325e35901db8675b41122
font_01_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 10496 bytes
SHA-256: 577c04642fd5f3973569f54801a7b1000ef9a9fa1c3e096ebb1fb2ea414df25d

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