Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8af2e8103106ae…

MALICIOUS

PDF

77.8 KB Created: 2021-09-03 18:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62a9c7b47ff00d9d4dc1c0f29f5cae5c SHA-1: 51a2629b8a4a534f38391eca8105876af656d731 SHA-256: 1d8af2e8103106ae4581dc29f5818003293b6b2248caca9fc2b111e989561562
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of link farms on disposable hosting and compromised CMS uploads indicates an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e5c59966e---33016852280.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f21c4f2784b---bogizevavupinukido.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/370c46250a9010344b8841d52fd2c5c9/41245675949.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/97838148567.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/5855406938.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/40378843665.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/fitadubegipivanegenavuka.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/29535267590.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/boleribezobeviton.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d09a1c14595---70031995281.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sabuwezapumarosetuvijup.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/petodovonuvinibafo.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pefun.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/17b199cc2a7429167b38d513fb4d58b2/90729859499.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/10/32160157311.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d26aac88f---77480603640.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/pimexizobami.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/48583781771.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/vibumaxotazulotewezov.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/gibivokitimuwix.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/21326108310.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/67104476101.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf421e878ce---kojuwajar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bmw+x3+auto+or+manualPDF 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_off0000ccb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB5 17476 bytes
SHA-256: a2fbea8a4b6e3e6edb3ab1965d064da85f983d3be0eead22601d336f4fd21d0f
font_01_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 10392 bytes
SHA-256: 545f2975f907e379ed78f052267362f732cdb7fb598948a84da066f406f29c5e

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