Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4adf072a106ad2…

MALICIOUS

PDF

76.6 KB Created: 2021-09-02 04:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 924f8676300f7889cc1dbaad82a60466 SHA-1: cd062cdd5257d8872aa660c85ce2e5f0cc2efbf6 SHA-256: 9f4adf072a106ad2ee20275b6de6a296208c08441d345e638656f0fadcf7db2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for link farming, likely to distribute phishing content or malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=new+fish+discovered+2020
    • http://architettoangeli.it/userfiles/files/diruxofafonerusujuv.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca85a88269---sonanogomatos.pdf
    • http://www.polni.si/Images/files/5818799589.pdf
    • https://filetorme.com/upload/files/wuzutonaxoboke.pdf
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/gekaxutulog.pdf
    • https://floridainvestment.cz/files/file/timulurijodivuje.pdf
    • http://cbcom.fr/ressource/site-image/files/2719439662.pdf
    • http://www.heksan.com.pl/file/nuzarosit.pdf
    • http://musikpark-live.de/userfiles/file/genamukeduximorimefa.pdf
    • https://speakingparrot.com/upload/ckfinder/files/tifusikesesawusikisagula.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16082f642dc64a---rosirusakowalof.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607873a2b00ec---bikubefusupeninadi.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0d3bc2f4f03673c8f9600c6b42c5c2b2/96405341485.pdf
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/mh8ovn9pjo1q0a0fatlr4a29e0/besepaxojawizutaleg.pdf
    • http://domeinbeverdonk.be/assets/files/file/91938139789.pdf
    • http://logo4you.dk/userfiles/file/mufonetaginivu.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/j3oc7fmdm685dc8e4fsmka0boh/rikavemox.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819d6ec1a82---93680725739.pdf
    • http://language-coach.pl/uploads/files/56599821644.pdf
    • http://grimastone.ru/files/10872552785.pdf
    • https://businesslife.com/content/files/murorudid.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161179859ef869---kajoze.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097831e80593---dadojuv.pdf
    • http://www.pethouse.es/ckfinder/userfiles/files/sazebopowaruxu.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_off0000c803.bin
0d75a06cc869daab55495008fadfa50ce4cf3d2387caff384b700827538da832
pdf-font-stream PDF embedded font (sfnt) at offset 0xC803 10536 bytes
font_01_sfnt_off0000e040.bin
c4eea1b7a6e59f3cf97f586da7016fea0d55b390e33314381a8053426c1c8caf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE040 16928 bytes
font_02_sfnt_off00010beb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEB 16792 bytes