Malicious PDF — malware analysis report

Static analysis result for SHA-256 608225ab9d1a61c2…

MALICIOUS

PDF

94.4 KB Created: 2021-07-26 17:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 3996f4f7da3dd012dc857d8dac7b0116 SHA-1: 8922fcd2c306b4aa99c0923c451cac5f21a36d95 SHA-256: 608225ab9d1a61c2e0e56991d9791d62e8f33eba24b6d9cd9e33a8cfae4f7c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs and link farm structure are indicative of an attempt to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/deiiouopv2s6vcknt1nuuhml25/guvetejo.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dde9aefd7f3d5e37ca0b8030ef75beb1/35328406929.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f767261a02---lolekadad.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7d3240079---14656958417.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607795e1038ed---52916135470.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/sfvf49eteg7v5jq9g73njbr0pe/witazukow.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/72e3e1c231fafe428cbe727668efc019/vugajoxobulop.pdfIn PDF document text
    • http://voorwindenotariaat.nl/app/webroot/files/ckeditor_files/files/bodixupuxedunupo.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c894c22cd39---39460337227.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/a3090ff1cc6ed1ac52755e05c164ed8b/46003703603.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/58373756821.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210613152359_n13w3o.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607700e601491---817753073.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/daluk.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c67e7de3866---nedokuril.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/repexejizewovumefatuzizu.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/18577176705.pdfIn PDF document text
    • https://ivaco.it/file/12294470473.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c38488be8f---56379589038.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c539a23a751---petopol.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/limuvudapofesew.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/92903893465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=gestionnaire+de+mots+de+passe+sur+chromebookPDF 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_off000106c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED7 11104 bytes
SHA-256: 9afafc9090744edb5595d20d3224376de7cb89a4388f2c54c9155d3756ffecd7
font_02_sfnt_off00013856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13856 19148 bytes
SHA-256: 8361493892d2fb8f88c8a8e6f08f6fcbe2474e570f0098e8a62b5c5354915f54

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