Malicious PDF — malware analysis report

Static analysis result for SHA-256 9891724f1d166aef…

MALICIOUS

PDF

86.8 KB Created: 2021-09-13 20:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aae3f4fe01971cd0db240eae68982fdc SHA-1: a2b938cef97dc266da330d81105b02ca36178890 SHA-256: 9891724f1d166aef5fb05ab5407424939171e24be478e45cca46f86e4b6ed047
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host links. No scripts were extracted from this sample.

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 https://diphong.com/uploads/17880580701.pdf In PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/jakuverubuvuveduzeke.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/49061414210.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/mazefiwipokanijolitig.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161353a9a3700f---76987101720.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/89726525798.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210905022715.pdfIn PDF document text
    • http://ed-union05.ru/files/file/jamekarubamotitizosema.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613aca059d502---80103977661.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/kakevajisafajaduje.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3b220dcb---nolofidarufukavigumiporu.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/19297302864.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210910_B33C3570882A37CD.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/legagesejemifusezuf.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7e608c5ca---madugiluwejaxuvubu.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/93769862832.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/visumoxiwaneguvola.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/gimirigakusix.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/60436654947.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161309df96d02c---momiguzomewoxijav.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/8039078951.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f33c2771ea---79405716172.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/zikara.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/fojaxe.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/pokabelefuzatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=barcode+to+excel+android+appPDF 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_off0000f0be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BE 10492 bytes
SHA-256: 4d3638bfa4baf7d1945ce8e3cab38a50909b3348c69ea88ce8744ca308fdab71
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 17188 bytes
SHA-256: f1a8f7dd4e80b510df0919e3920866d126f941fb0affde6147a5b8000fd49527
font_02_sfnt_off00013522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13522 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.