Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b25ee4e5e22221…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 04:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 71534d85e6eb85d4ccc24a4d6d3e7b61 SHA-1: 77e452fd97c94083feb2dbd453959f4ad9b2c509 SHA-256: f1b25ee4e5e22221a8cfc4c88ac5544f1c2a98400823fa195fd6d5e2ba89a57a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pmfegypt.com/userfiles/files/kovawigaxoxofivimekate.pdf In PDF document text
    • http://mictrogiang.com/userfiles/files/18948070197.pdfIn PDF document text
    • http://paulsaperstein.com/userfiles/files/77881173724.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070e3b67a21b---lunibosixevipas.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/802aec0922538a64988183afd2c31a14/talubelomizikizotugijeto.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/nu2m6o5abgag8t457k9vo81ga8/3088345129.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/aeql24bce219hnb7p016kumvi3/rorefumozazujukovumokaxuf.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/45422437307.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/subatojobo.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210728080506.pdfIn PDF document text
    • http://mebco.ru/images/file/mowunifajowawefimopas.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5751a8577a---goxenejub.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dde2ad5943---8040114615.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/7982651565.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607910ba35fd5---malarosisugurojexit.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/9307616228.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134c210e2e80---19749652510.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/rilefarexeb.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/fewudagubora.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29dbc5765---95426009479.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/32122672240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=well+known+port+numbers+list+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_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 18588 bytes
SHA-256: c377417f438c8742953686224d88a409ccbba7f101fb4fba63d9c59e1a4718de
font_01_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 10908 bytes
SHA-256: db1f6e0f59031e05c5c5840089a01503198fd730ca340b7b82f3bc6e87960e10
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1