Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb2b80d14527374…

MALICIOUS

PDF

90.0 KB Created: 2021-09-07 17:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ca129b2b144b3625fbabcf7f63a21f9d SHA-1: 1714f31054d4c5bc6bcc9fc32062733d2e1c0c86 SHA-256: 7cb2b80d14527374b10a5dd8023a3698789fa67a7d97561fc20e8790d50f2a2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest it's designed to lead users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://harrisitalia.it/uploads/file/mikijetimopawakudomaz.pdf In PDF document text
    • https://banderlogclub.ru/Files/file/72562509823.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/63730329096.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/tilodujepopedabunepu.pdfIn PDF document text
    • http://enricobarraco.com/files/bujusewesubanuviruto.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f44815d3---98036518146.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/47127289597.pdfIn PDF document text
    • http://metallpress.info/files/bebirozujedofediloxiv.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a8695b5a98ff3a011cd079a4cd9f4ba6/lemixidugufofadexofagege.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6262648d0b910e4a8f5d87fca9aaf504/nunavarog.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v5k3j07fnks5a4o5b9qv2dll39/betifalanusixudozilo.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/manuperoxopavuwokamif.pdfIn PDF document text
    • http://handgun.ee/media/file/21361537130.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c3637f680336de22469b27c0464e6ef4/248419628.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/jelofop.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/41bd7d93373b72a7d15e5cebe42dbd92/55547463467.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16088b5e164c4f---vudemalunitedu.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f30b56748---12507870818.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/gixoselo.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/62402062399.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/laladonanaditisimekanamaw.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/sobanusul.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc044c6b4e---21148649188.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/8712634357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=components+of+health+information+system+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_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 18400 bytes
SHA-256: 1bc6117876cf6b17bbf87cf56d031371598c1cf78d0c7ac50dab5a64d2d83e64
font_01_sfnt_off0001293b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14152 10908 bytes
SHA-256: f0db5193d082163ddc9ae622962e014f9c6c6a4fb6c23d7dc53b964c977f549c

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