Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38caffb4600a524…

MALICIOUS

PDF

81.8 KB Created: 2021-09-03 13:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7f0f67535591203c892fe6baf49932b SHA-1: a20440ae98af731136b010ddcf149140a85bc650 SHA-256: d38caffb4600a524abfff87526372174f3e4a34e0de8ef1ccd81f8295422e8a3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs suggest a link farm designed to obscure the final destination or to manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c9de2688a2f5268a73943219c83b3967/57823886962.pdf In PDF document text
    • http://greatnice.club/updatefiles/file/mozugepagelobegego.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/11681461532.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160efe9c7ca0e1---miwitipodipejisufo.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/99802230198.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/038e4a6181f8af23908481572ed2ecc6/tojekeso.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/f15a8c328ea8b0dbbb2c9d6338f9ff2e/vogutifuveg.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/faxapoxefutebirikusalu.pdfIn PDF document text
    • http://contelex.it/userfiles/files/rotisaxojoromubefebape.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16081dcf4c7d10---dujipedojir.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/agol72ubijherrp2s47mccmj2k/nudojadam.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ad9c1cb221a8f7bed2d63e62941bf98c/40929040028.pdfIn PDF document text
    • http://garderoba.sk/images/_file/sibelis.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611568e455fcf---23797023366.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b62bcfb4241---gowogoxi.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/kisexit.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/tudamibutevod.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/zisowir.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/78800768213.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-7-19/20210719014915182007.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/kcnmomfuuq3ou0368v28t8r8m4/26730140702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bushnell+reflector+telescope+manualPDF 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_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 17092 bytes
SHA-256: 6cced6512eacaabef3b3403936d0e19d15db5dacba993177b83541d4ffc315bf
font_01_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 10804 bytes
SHA-256: a114d19f8a7e2a06c807f90e38d88e323739e681c015f5941bea1fac9652d2e5
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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