Malicious PDF — malware analysis report

Static analysis result for SHA-256 22517bbe3c483cee…

MALICIOUS

PDF

84.4 KB Created: 2021-07-23 06:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 98fb3652c7ebd1c2559eb748c4145447 SHA-1: 656a4647954cd1843f766b2ac22c45c18e031cb6 SHA-256: 22517bbe3c483cee86d2407e5677dc8fbf74f0042ed8c0dd741e74a5c1178b5e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, likely intended to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, but the overall pattern suggests a phishing or downloader attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26fe347eb6---55766996136.pdf In PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddd7cdc78---koxokujelowejivojosago.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a1697c9b9dd---36512503901.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/wadugotulipoz.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4cbfc12bd---14595285795.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/3hool8l23r9bib3mpr5ng17114/25219281967.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/5507567042.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa02c7eb6---52438682225.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/lobimuro.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/watagugilodijeromimaja.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/98998219058.pdfIn PDF document text
    • https://triosms.com/userfiles/file/morebo.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084559e7008e---60528545655.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f0d45b631f---jaxulika.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/a3c89d0448718c1ac800447b9aab197a/59780634829.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/gameramo.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b680a2b9e5a---975887435.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3249aa7273c744db010d2e0e29b55282/81163658302.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/kifapo.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b5ifc2se2faole1pq3r5nc78s7/40534120108.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/33b9bce832bda6f55b8e2d2d7be32497/gekofuwe.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/1d6ebd5534982618a9229adda93feeb0/nepibugamepaseduni.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kogogasejamevozaliwetavel.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/7j9ruja3q1uvv7fnku8mntsogm/90139280575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=drone+mobile+installation+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_off0000e766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE766 10508 bytes
SHA-256: c37a18590fd00e5a83be92c3e3cf89d01b5d51d816fac3a5487edb71be476f0a
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 17044 bytes
SHA-256: ae472cafb105461f25b2162a1e4fd472688e90790666f2259b2ea657085b52dd
font_02_sfnt_off00012c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1