Malicious PDF — malware analysis report

Static analysis result for SHA-256 666c986ebb5bb09b…

MALICIOUS

PDF

106.1 KB Created: 2021-06-29 04:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a0c487b6273761c6a214116626b7c7cc SHA-1: edd8bfa4ddf7f3bfb9fc081e81f1838430aa3b8f SHA-256: 666c986ebb5bb09b358c537f7d9b282a5b9fda9e607e8ef25fd344b1f7c1f09e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites, likely serving as a lure. Although no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a011fec005---84166075201.pdf In PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160879d3544c74---86172951092.pdfIn PDF document text
    • https://timjanen.se/anvandarbilder/53/files/xovabumafijo.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///duvozetoraj.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/dibafin.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/77044680357.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fce25cd727---fanajanin.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6cc98bd85c50698010bd698b0164bf1b/54764452780.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0e053cab---6574269913.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e226b7be39e8f99fcbe32e31da9e84e6/95530248526.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a13a2e14497---80005695897.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/73043627844.pdfIn PDF document text
    • http://skncn.com/u/files/76245172689.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/90466b94ce3c26c54a58e6d875878843/51673975528.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/fufofe.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/mjilfeorndg8nuk8dlssdvk00f/vovirefoto.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/jeliboxatajesen.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/d62moe54o2s6hju0o63l502q3r/47169383543.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be84d44c62e---wasisosa.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/14159808547.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/fiate6jp6tlamaqfugk1rgd274/kevigikilekidalatufuvaro.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a43bfa8a0a9---11683430845.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/34873480167.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=the+boat+of+a+million+years+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_off00013612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13612 10980 bytes
SHA-256: 40adffde44fa3d3031aded62635f90347f59a7825548731018268f5f08025723
font_01_sfnt_off00014f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F26 20012 bytes
SHA-256: eb0fb47404dff48aec9267e5daed5579d5b0d61f3654279ba566a624b7786f03
font_02_sfnt_off00018159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18159 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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