Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2bf1eab0672e94a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 16:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 93fd7df7c61f1c17febbe64c8a32a6c7 SHA-1: b3832a80a59d79801b2e734b6f064ed3b38bbd92 SHA-256: b2bf1eab0672e94a27db55ebadd6ad5a9b02880f55ff6226f9931fac289d5676
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm, likely intended to manipulate search engine rankings or redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, possibly related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://canoeing.by/pics/files/savew.pdf In PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/87088604688.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/mulofive.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a9d09f762511e400b813696ecc0ebe68/54793664316.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161347e372f6a0---14881909601.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/39218021973.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/buwototazomisinu.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/sudejamije.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/56936745982.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161337bba70fb3---13134165013.pdfIn PDF document text
    • http://dreamscar.eu/userfiles/file/67750956026.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/72901226342.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/sogemaxebupoxotitavedugi.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/73886970192.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/37610978828.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/bogigumidonurig.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/vejifawisisuvonur.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/68575756160.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/kagisa.pdfIn PDF document text
    • https://fivetc.net/uploads/files/12349566071.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132af69b3f4e---juguk.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136502c24ca6---45826702006.pdfIn PDF document text
    • http://dfanchem.com/upload/files/63138555125.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/83036574007.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/disunafila.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/zasefaluk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=2005+chrysler+sebring+service+manual+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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 11548 bytes
SHA-256: 93313244deb997e72ac38078f0fde55f0b18b4d7f49964f7efefeeaddd8ed63d
font_01_sfnt_off0000f3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BA 16296 bytes
SHA-256: 268a0623135ebf91ac36db75663a839e41e99f8ecd5d1e6ae845b9794c8c8f6f
font_02_sfnt_off00011e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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