Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d96b140970c2857…

MALICIOUS

PDF

81.8 KB Created: 2021-10-08 10:47:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7935e4ffb3b8a4313afc8702e150f804 SHA-1: 7a1d943343370cc94a9bf6323a477477ceac5720 SHA-256: 9d96b140970c28576d60aad8d7727ebe92c33dfe96af452be066bf949bf4f323
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/pelexajazuwakuririvef.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0140e2d02---naxulavitofigo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/713003fa70c12d0c499a36fb87e4c22d/54918300492.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/visanif.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/nijumalugozobi.pdfIn PDF document text
    • http://halaljones.com/uploads/files/36661901432.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138bbe35cb8c---35367354325.pdfIn PDF document text
    • https://papiratisk.cz/soubory/xopexituwoleluboseni.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/26299944027.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/zojutokezobusamo.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/riteg.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/87707051491.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/velij.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/41914915741.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/6613023406.pdfIn PDF document text
    • http://ranch.pl/files/file/48294371030.pdfIn PDF document text
    • https://istanajp.com/contents/files/4415134679.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/74510784729.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/67058292334.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/lipibixubedi.pdfIn PDF document text
    • http://tzsunup.com/upload/70820367993.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/lebipotipenawap.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/6173872737.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/pujozasujinunubodipu.pdfIn PDF document text
    • http://atsolution.org/userfiles/file/20210911031522987997437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=hsc+previous+year+question+paper+with+solutionPDF 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_off0000d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE59 19260 bytes
SHA-256: 0eded673b93d6166682fb0202c5b7582bd544b3f38d697cdc0728840eea86eba
font_02_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 10976 bytes
SHA-256: 55daa24df976d3740996638ae3005303b58ef650b3b6c65ed999330b16f6367a