Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc11dce95c6f6f5…

MALICIOUS

PDF

79.0 KB Created: 2021-09-17 18:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a893f430a46e0d0ff4351f06c3ab6c7a SHA-1: 0d43daff3c9921e81a48e193898a3e571737c210 SHA-256: 1cc11dce95c6f6f51e96a38805af040252ef965adfe76e2b53eb81893dbda08d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links likely serve as a link farm to redirect users to malicious content or further download stages. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=cbse+class+4+maths+book+pdf+free+download PDF link annotation
    • http://teusz.pl/UserFiles/file/zasegapetokope.pdfIn PDF document text
    • https://linker.tw/files/66909230565.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/89248149949.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210910161055.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/sijesijeduwezozodov.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/2565162196.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/14363286423.pdfIn PDF document text
    • https://medtek.vn/storage/file/94802086978.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/58663069290.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/46872125309.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/g8vvn02rvfur146040bunhkhk9/lamisakewovamosat.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/wuliwuxaselu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431bd5ab2e9---59278094566.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9474a645---59136151891.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/sqgevi96uihl7rn7h1sa2ou8n2/litarikopapasevuzakedot.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/vamarojivo.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/20351491636.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/fixilikowodulatedifewulid.pdfIn PDF document text
    • http://blccy.com/userfiles/files/fevena.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/8801510173.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/repowegozo.pdfIn PDF document text
    • http://proartgaleria.hu/files/files/tezevonebajenujolot.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/gasosuvexopiboxijun.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_off0000cc90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC90 11220 bytes
SHA-256: 133f98e4b5800cffd13fa205ec4a9ef38d9c59fffa6bfdb1112778648a5aa0a3
font_01_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 17596 bytes
SHA-256: dde14f38f03399c462cfc7725673fde64ec03a84f6febe771082793c3f81d053
font_02_sfnt_off000114b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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