Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5a2f1e6f1ae43d…

MALICIOUS

PDF

100.5 KB Created: 2021-09-18 08:00:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: edf8d4572c7dbfd0ea7c902f88f02ad3 SHA-1: 60a547bf5dfdabe6dbd868c64de543d180948297 SHA-256: 7c5a2f1e6f1ae43d5d9502dc54f794c961489d701bdfe2cd99c1703f5cc42640
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a common tactic of using PDFs to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drentmedischadvies.nl/uploads/files/megovasorijigo.pdf In PDF document text
    • http://metabolit-plus.ru/files/file/19592482174.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319c6831564---93306375447.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132fcd16ee8e---dunufilaxikexonerefapa.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/monafubenuronupotiv.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/9425160520.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/97101225312.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/80157350615.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/79562579704.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/sobubesuzej.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/vufenon.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/74441423160.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/55358895285.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/58100428538.pdfIn PDF document text
    • https://iwistw.com/upload/files/benumo.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141fc15bfffc---15728423656.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/61356356583.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/54383188265.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/derufuxazin.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/vezazekekapo.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/kiwovasujopeka.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6c77aa0a3a99c14f009b118aba7473e2/pobixobutemakis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=can+i+root+my+phone+without+unlocking+bootloaderPDF 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_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C2 19356 bytes
SHA-256: 3ea9dff2dd80f29e358440ef2d533a6cdc4bf56d7e0eff90b12c7931a17167bc
font_02_sfnt_off000169ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169CA 11356 bytes
SHA-256: bec2fab77f9f7adeb089675664e0819fea378dd45b2aefb0f4a71cc6e1a2c631