Malicious PDF — malware analysis report

Static analysis result for SHA-256 022a2688438a9f27…

MALICIOUS

PDF

77.6 KB Created: 2021-08-08 13:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ed4a3082d66cb0f27a5cda371fe216ef SHA-1: 2ac40a549a299cc85c164d16735424ff60265bb6 SHA-256: 022a2688438a9f27215f950d0a1c74405b5a9b685a21c9177b9984cd28743c2e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://digireg.nu/upload/resejevixitajuposidupaj.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/23989d0109589b34cc6ef56a060ef069/giligupikuvajikomifib.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/powitogukurupodokasa.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f196e6404---43335745696.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5deae480e2a9e2dbec39c0cc7466a665/kufaduvenipegexek.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/towejadilaxomuzedar.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021622042225358.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/polanamegumazowunoseb.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/1100836242.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/34684532644.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/37288243407.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cc306212b---26492976330.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/91548675356.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/8432212041.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/56657295975.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/258052c97cbda6471a9aa4a00be31aff/22520790318.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/ade38acd69ce4f058e41752b56b8b904/vojimekexofu.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/63027888753.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0e38787a2---kisakumone.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610e5f4123b22---pevijoleso.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/76327251331.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/af1655daecf5ce6d46ad327856c72776/makusiduf.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kajifatojupelojuxaje.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4560638b1b6855783afff142b87d86ec/fovelitopijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+do+i+program+my+craftsman+garage+door+opener+to+my+homelinkPDF 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_off0000ca08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA08 16200 bytes
SHA-256: f8f20ccaa7f3899755d4ddeddb9ab124e9dc0aa076670b713cf07e134c51fc1c
font_01_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 11352 bytes
SHA-256: 37fc8cf4b2ad6d937b1d01c579e12879d1eb85049b960f7c795136b148f46e80
font_02_sfnt_off00010e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1