Malicious PDF — malware analysis report

Static analysis result for SHA-256 775d16c66fdb7363…

MALICIOUS

PDF

89.9 KB Created: 2021-06-19 15:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ef4b1b4e6b276b708d14316859b6c31d SHA-1: 7211d761ab49c5752ab95298220b4ad4a02a4800 SHA-256: 775d16c66fdb7363e464c3a5c9b4adc0e52f2e9acab2c3264514b2ee61ae7177
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, presenting numerous URLs that likely lead to further malicious content or downloads, disguised as a search result for a PDF download. The presence of embedded URLs and link farm heuristics strongly suggests an attempt to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/fd0199c601a62d45376bcb519603369a/36803086995.pdf In PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/viloved.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072508f96b90---21678017299.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/robowivawemopepisomoj.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67383776265.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6181355a2---gaxipujizivodujalizokev.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/rivutimunur.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/putavefutesatozaburor.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/pogedanitiza.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083a34f992af---33822816934.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/tusevivotiremafore.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/339b320c83971acd2108bd2475dce8d2/37120525026.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076f37eb2d10---87975597608.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf44c980bd0---42081760979.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/46317535546.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/patilakalilufotopomatik.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/47054376533.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+secret+teachings+of+the+vedas+pdf+downloadPDF 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000136eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x136EB 21008 bytes
SHA-256: 261183a939fcd05fbf286d8243674fc0af5341b3693f55586ed08f2a73edd445
font_00_sfnt_off0000fc32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC32 5520 bytes
SHA-256: 44358703f58c80bce73db1838d65c110f1e2da99174436098f0a496e7d6d8684
font_01_sfnt_off00010f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0B 12040 bytes
SHA-256: f9799929478340a1c89ef95821b98763a7eff4905f5e3b1ce1a9602843d896a7