Malicious PDF — malware analysis report

Static analysis result for SHA-256 950d4158ed963cb7…

MALICIOUS

PDF

75.3 KB Created: 2021-09-08 07:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a03003d4c0c0cab3a3cd5fe37c02cc8b SHA-1: 6f60258eaa17db9940c028674ce3299e9ef44c9c SHA-256: 950d4158ed963cb75aa4d41c77e0b84536f3930c0af99f418797bf53d8581afc
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of external URI heuristics and the compromised CMS upload link farm heuristic strongly suggest the intent is to lead users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ip-golubev.ru/ckfinder/userfiles/files/58962871355.pdf In PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160806c559494f---2262979719.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/d557a37e9bfbbf41f56a718e0bade303.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/50291791466.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/pm8cac1voi8dfta2eqb3ptdpl6/30876775379.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/dobokebul.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021050519060774.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/86703547241.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/segipaselutukinosonibefa.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/27370966159.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160768bc10dfeb---turupadedizowi.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gosixodobuzulidokemava.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c794dd4b4a---40456286283.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/50435024108.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/narewetalavalorisa.pdfIn PDF document text
    • http://gistys.com/userfiles/file/80288923795.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b130fb99bfd---ranakarataputerutusop.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/puzuzidupuf.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/3uhu3g7jm32gjj5tdeb0svpbvi/zunorofat.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/27425190498.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f76cdfbe6433a0c5c14b4ab6dc9fde71/96622488662.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/33c132079ccd05d236c2d5ef504439e1/79196192667.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/gakexexapuzigoweku.pdfIn PDF document text
    • https://cmoretv.com/userfiles/80347405682.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/47bb8a265e08e5e1b2fa4e5b14de2e7c/99976556885.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/zanaguwofirutewotawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=historia+timor+leste+nian+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_off0000c13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC13D 17440 bytes
SHA-256: 12c87ea8d29fced6c9207bb0db4a5d0c73c6e997d1ae83043130923ab4b562c8
font_01_sfnt_off0000eeb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 10652 bytes
SHA-256: fa320aad5b63e45028cdf23ab089fe981b31791144d44b6dd2ef32ab577fd2a7

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