Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f18b84d8ab9bcba…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 19:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7661a01a1d49fd651555b7700a64b9ea SHA-1: be71e962a3e0b9dcafd2890634b1d8d8418108f1 SHA-256: 6f18b84d8ab9bcba9c13e01ffc7534754ab2f2a3e60ee56d90294a72816c00ef
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely to facilitate further exploitation or phishing attempts. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://panda-es.tokyo/yamituki-n/uploads/files/13504258984.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4ae40c662---dizozuro.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5477d69b8ce57f0057c860f2bd501ebf/gefuluzexefojun.pdfIn PDF document text
    • https://lecourbe.dk/userfiles/file/14529435026.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/19416240250.pdfIn PDF document text
    • http://screen.by/images/file/walaju.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/mofajebemezezorolexeradog.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f877a816f12000b6c1e2fcadca260a0c/24236542322.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/63415914004.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/0891hri00p8g8hnobgtni7phqb/30430228214.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105cb8dbb108---fojarezipaginasafojidolot.pdfIn PDF document text
    • http://goref.ru/files/file/luzezizufubixigipeta.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080eb7671612---12538179380.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/lixokemofatenonafafafuv.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/81515659522.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/raned.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/eu5veps30jt22hrssao2an5bmd/zalogowivururuto.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/kerobi.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/5c9704cbe222a8c21d46f4c4ff79460f/64323209780.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/venorododow.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969e446bbbb---tudatunesuxegune.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/cebffbe7ac2a0a3ba39e051dc31752ab/kebiwopaverovedudarade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=carcassonne+expansiones+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_off0000d640.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD640 16996 bytes
SHA-256: 6a6d1562a2e09948bc0215d51185f87dbc6275e9d9969621e51e51c86ad05739
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 10600 bytes
SHA-256: a68e5e41fd06dc94e6da9a24ab1da90e0a81c00724dd1c1e50e565f3d18323dd
font_02_sfnt_off00011a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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