Malicious PDF — malware analysis report

Static analysis result for SHA-256 8043d8c15f357032…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 22:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 420ef7df42834c6dc599568ecd25915f SHA-1: 36877e86c69cfd3f2ed65843c140aa5dca836882 SHA-256: 8043d8c15f35703280455f4f75aae693d5bd30b6c39f0f1e8013c582a51381db
196 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands, possibly by leveraging embedded scripts or exploiting PDF vulnerabilities to download and run further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=a+technique+for+producing+ideas+by+james+webb+young+pdf PDF link annotation
    • http://thienminhgroup.com/uploads/userfiles/file/70155196682.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/8465378953.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/b97013bf708c54f23cde0cc53343f608/91693272199.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/85781034902.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/99317362195.pdfIn PDF document text
    • http://salwex.hu/file/9870310610.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130fffe06501---nedif.pdfIn PDF document text
    • http://nhakhoauytinhaiphong.com/upload/files/daxenupenugafu.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090521045962.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/30421831916.pdfIn PDF document text
    • http://qdcmd.com/data/files/fajatoweluxasilelowuxedob.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614d2d24b6ed1---bidul.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/94835516871.pdfIn PDF document text
    • https://jss-moms.si/upload/File/faxexazudomu.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/napepavududinet.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/13704129778.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/94492839251.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/jixoxusofi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161452ab642d72---21199961694.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/36798485327.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/89057030368.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/xudil.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/84454253309.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_off0000ada8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADA8 14688 bytes
SHA-256: 82ed393936c080d0c5b0a45681d3e8f98aab5eee91f6eaabc270bcac0843efa6
font_01_sfnt_off0000d260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA77 11720 bytes
SHA-256: 8f28841313dbd30cb50854eeb6be9ce820fe9b3f64dec835ea8849f83c0ac4e1

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