Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5c9f9e2b5e91bf…

MALICIOUS

PDF

77.0 KB Created: 2021-08-28 06:30:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff0a252c38f40f5e09f95b453d4c188a SHA-1: a276ae60eebabfe08479f27c6a636ac5debc9640 SHA-256: 8e5c9f9e2b5e91bf0c8d23f1ec2fabe015fa561b2ca3ebf7abd50e700abd22d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/79366371836.pdf In PDF document text
    • http://studiofantino.it/userfiles/files/34538774525.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/74858501236.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/2v34v71eiighks7t499tgvp14d/14042877909.pdfIn PDF document text
    • https://laps.pl/userfiles/file/48387971444.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/senonagumidelofok.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/84123410311.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/tiwobikixupogix.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8da52866---4328253974.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/4013832186.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/miraxuxa.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/vowikisesimulefugadu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30101d21cc---50208581532.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/16308885298.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f76f07a07c---lujex.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210704_205413.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52e90291d5---47211469023.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/30353000504.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gphvh2hq2om699csif5lsivovi/wobogo.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/zimavogiv.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608942517afcf---47445170905.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160de7d8640536---3675969360.pdfIn PDF document text
    • http://sparkpro.lv/content/file/3837537251.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/rupadipobolaponewudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=elements+of+poetry+graphic+organizerPDF 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_off0000c8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B9 11084 bytes
SHA-256: b866dd7896e29e22ce2283fac5e2d1d69c49a737bbd3d556bc80141b19e874c8
font_01_sfnt_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 16852 bytes
SHA-256: 0156e6b32b98358455190ab31f434c080823d1ecc50b0319e30cdec8687fbbd6
font_02_sfnt_off00010d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1