Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8dc8f5ba9de49f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 03:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e6ede9a5a3bc281be67485b7a6a2aec0 SHA-1: 0b5a927cb3dd40884bba9a5c690996c757833bde SHA-256: 9f8dc8f5ba9de49f27350a712f84f749825af76b3ac92ece9861d936665a4a9c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ClamAV as a phishing trojan and exhibits characteristics of a social-engineering lure, specifically prompting the user to install a browser extension or update. While no scripts were directly extracted, the embedded URLs and the nature of the lure suggest an attempt to deliver a malicious payload or steal credentials. The document body was heavily obfuscated and unreadable, preventing further analysis of its direct content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://www.tobywells.org/media/fckdir/file/gigagojafakibam.pdf In PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7871dc1d3---20863920266.pdfIn PDF document text
    • http://kftchem.com/upload/files/326227448.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/tufotirakududibafekiwiw.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/rekasororexoxar.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/wufitemapo.pdfIn PDF document text
    • http://gewald.ru/content/Files/wiwosiduvuj.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/70878739388.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/zumajizaguxinerewisotumun.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/garovofugavibu.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/487770577.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfdb4c0afc---vorijepaporap.pdfIn PDF document text
    • http://airmon.hu/images/files/27407593034.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/zawisazozunozila.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/3294127386.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/35552978223.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d6433c4550cd80292f60c94127a6867e/wasiwatal.pdfIn PDF document text
    • http://i-physiology.ru/upload/21691667894.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210910_110711.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/95307970656.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/76912557750.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/vanisi.pdfIn PDF document text
    • http://thewesternmist.com/userfiles/file/vegebo.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109120912065688.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/vajadamubozekuxiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=olow+vpn+apkPDF link annotation
    • 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_off0000caa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 19432 bytes
SHA-256: 6ab6b7248fa34c128cf0bd3bc02f3cf47ac81751f712008aa9e22ab5b56831e1
font_02_sfnt_off000115d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D0 9924 bytes
SHA-256: b1888d6c5536a61d8554674ccc0e23e7cb65456fc1ba9c5e4a2d8f41e5970a8b

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