Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6e2b77fe8b2658…

MALICIOUS

PDF

80.9 KB Created: 2021-08-31 16:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b8c9fbb0f60be29e13511b54d0ae89e SHA-1: 0323a9061f2e084ccd5ec78c6c11a84f4b7ac5db SHA-256: 1c6e2b77fe8b2658ce5325a8e19f41e54c3fa75bafc5264b1547b2a265b47e17
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to download files from these compromised hosts.

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/3bc47fd219bee2b497083f3c34295a97/73833617843.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/afc4c3b93cc13d7aaaa1362c744851a4/tutatow.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///fowimelejeb.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dfea76698---xisudiriwutil.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/tafuxil.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/63568847949.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/rujefubitizipigotilugibem.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/1206a7a9d447d386189f50b03f96390e/16932253236.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610634ea6d11d---64932956185.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/19531669918.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096abd18cab6---renuwe.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc064ce7a6---28790746103.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/24803774787.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/mepava.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160892858a6474---radujesomozizixagexoginuk.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160da31c6a5263---95042904637.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202108190607127955.pdfIn PDF document text
    • https://ip-pharma.net/data/files/jamon.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/febux.pdfIn PDF document text
    • http://abwessex.com/uploads/files/taxalilel.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/rufomubek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+cdc+driver+windows+10+64+bit+downloadPDF 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_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 11056 bytes
SHA-256: 5cc9b916e7a129e526ab07a8a85431c7d45feb5632d4d8b8b1d8b43f3984197e
font_01_sfnt_off0000f0dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 16540 bytes
SHA-256: a61383a576c41759919fb2fc0cae607432205e766bffd62b5c11c8bc6364081a
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1