Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f0f58d6cfd116d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 05:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3c105f4e0146c88a9b06b869c4d8d357 SHA-1: 68a0a646339a3f279934984a3c056cfc5055a606 SHA-256: 67f0f58d6cfd116d8ecc464f6a89ad582a9b6750a92c1c4ad2244f1c5f3af8a5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://inwebjor.ru/uplcv?utm_term=types+of+pragmatics PDF link annotation
    • https://jbdclothiers.net/emailer/userfiles/file/14217141649.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87dc92a70---36410671245.pdfIn PDF document text
    • http://indemo.pl/Image/files/dapiruxedilosolurozanu.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/japedidafagoxubopusaw.pdfIn PDF document text
    • http://0048.pl/48files/file/84649590933.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/lipaxijoratazi.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/gikizezuvenorufitafebim.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/42730433212.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/2363238a119293899d1c5d9414a55d82/leramozifetisujezosito.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161492f271fd72---rofoziwezesilazar.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/porim.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/88203168549.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/julunavivov.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d49e299b69---78724572576.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/segarazinu.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/92963288535.pdfIn PDF document text
    • http://www.pvvc.cz/files/kekanawunasilovadebosezok.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/kebexi.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344328ee9d7---fasiko.pdfIn PDF document text
    • http://metallpress.ru/files/45920343805.pdfIn PDF document text
    • http://aj-freight.com/ckfinder/userfiles/files/loletugotovulapufekadorod.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/5197008963.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_off0000b161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 14992 bytes
SHA-256: d2f4facc5e239083497e88325e5eb7c2d83aaa8c8760ca81732203a6f782d8b8
font_01_sfnt_off0000d70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70C 10752 bytes
SHA-256: c2c741b4a57cdec74a32f4213d395233c6caefaf241db8b3ea59ef752801ce3e
font_02_sfnt_off0000efeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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