Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d67a08a8d3b6b3…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 01:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 16eb178fd82181b2191a3746aa5890e0 SHA-1: 268c792e24aa4d982c721ae3d02fd79935aa9ebb SHA-256: 90d67a08a8d3b6b37d3cb20b87122982638426d5c349814f884dcde2a12d0fca
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts social engineering to prompt the user to install a browser extension or update. While no scripts were directly extracted, the presence of numerous links to potentially compromised CMS upload storage and disposable hosting points towards a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be malformed, likely due to the generation process by wkhtmltopdf.

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
  • 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 https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2157b3a91b16488ef1a430f53106aa6a/melewegajunuwomuku.pdf In PDF document text
    • https://partnyor.az/userfiles/file/72390400110.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd24e561dd---jasedofozozewetenuxut.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/44028337375.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/76013425136.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/5488bb8f2177cfebbc27f2056b3c9b47/lazatakurikepowa.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3ac45031---pobenuzajakunamome.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d2b1619da8---84999619497.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/vakuwizumumuba.pdfIn PDF document text
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/21764925693.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/fukoninageruzuvinuvuv.pdfIn PDF document text
    • https://tsegypt.com/file/zuxogibin.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/0m1vnq7070u9gu9lgtg374h6c8/71703470871.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3ec539a058ba8c98d18115326de30601/jefamiwovowavozego.pdfIn PDF document text
    • http://uniqueaddress.in/crm/files/rumufalo.pdfIn PDF document text
    • http://rungruangsteel.com/public/upload/userfiles/files/1737071004.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d22821cf5c0---juxafomova.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/rogodipunud.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610762327c049---18680878791.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/c78c2bcbdcbc6ef8f70891c94bd5c140/39972003784.pdfIn PDF document text
    • https://stopserv.ru/files/file/latifital.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/mumimuni.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/3415723067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=snagit+12+scrolling+capture+pdfPDF 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_off0000e2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D3 18472 bytes
SHA-256: 1242c399749839fcdda53dd203cbe3203a5b749b81f9183958c536acf61702e6
font_01_sfnt_off0001121c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121C 11144 bytes
SHA-256: 26e68bccdeaeccd37264b4cc00a209e6e85a94afc292f850d389205c9fa7829d
font_02_sfnt_off00012c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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