Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0be4c9f71266905…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 11:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55faa1350b1dfc115b33e6451334e6fc SHA-1: 32e7f9abb0d2b9f70bef0eabb342c8361b4a183f SHA-256: b0be4c9f71266905fa4a01502983fd178f2a36e3ecbf1b9fe97a1cf84c008a30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the heuristic firings suggest the document is designed to lead users to malicious content, potentially exploiting PDF vulnerabilities or serving as a lure for further attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://akinmedical.com/uploads/file/3266361529.pdf In PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/46429722319.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607879b24ae09---gapulovakakosafikapipiga.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/70092467677.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b4faa911d10d10014def2a7987338b20/podunal.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/zevifod.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/7232729380.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/xosexivaza.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/kerobikipuv.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/84354344330.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/28374494299.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/98q8kopli054c00teims3no35p/wudebepazidekularasanisux.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/euaroslpvnlqcmhq4h5kaju0b7/sobefemimexidob.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/bejejukanenakilumed.pdfIn PDF document text
    • https://turbooto.vn/upload/files/57548928925.pdfIn PDF document text
    • https://sharenkon.com/files/66876459182.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/51932907013.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/37041021824.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/59325441957.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/fupo4sjkgn7dqa3mfn8a7sipi4/20853276402.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b07cc3b0f---61274018637.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/fuxupopekoronumufigufipeg.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/4340349702.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/kubojifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=concord+in+english+grammar+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 18196 bytes
SHA-256: f0b912662b8aef605c0b9c79dc86c7a32645def322881400f97f14f5a9a861ec
font_01_sfnt_off00010c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C54 11084 bytes
SHA-256: 60c1ab0b5d5f99c05b5c50fe8669e22ce4c570ac519ac6045ba0ab445e6b0010
font_02_sfnt_off000125cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1