Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b7bfebf42d59aa…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 09:00:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b5b7cf7df06c592adfbafba5ff304232 SHA-1: 3796161a0b51ea1b46d3f49c4ffa517ca5de79b2 SHA-256: 35b7bfebf42d59aacd32b2fe93859be5db8af6bc88fd310a224741ea9bad0c67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to compromised WordPress uploads and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=military+workout+plan+pdf PDF link annotation
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e44b46098---zagokuzatunikukefanizelup.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/30594957467.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/63294357408.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ff21abd4a19---gisifolaxeru.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/52611644504.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/80838140701.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/fekumareruvanupekiru.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/833eedbf078ae8a550e57806a94036ba/gitaw.pdfIn PDF document text
    • http://totoumi.jp/upload/file/rivupobapebozi.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/tilitaxejanelef.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/nukevobagebefekesatem.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f46e09262f---28637275654.pdfIn PDF document text
    • https://insinkerator.us/images/uploaded/file/kevamegenujomifowaxid.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/68906852394.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/5178874075.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/vuguzisu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc79267d07---50358091609.pdfIn PDF document text
    • 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_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 10576 bytes
SHA-256: 884f463fdc2f25315497d013f5d7544db09b2e363f2226487beeaca4a43ccb26
font_01_sfnt_off0000fc2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 17488 bytes
SHA-256: 1b0506045c8e92b895bdb30ecde7eeae8266b895cae1279ea4904263cec3e3d9

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