Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ddf9d0d2422cc97…

MALICIOUS

PDF

69.7 KB Created: 2021-09-06 12:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fb4697f92d86980a73eea0d111d2ad0a SHA-1: 5b02900f2968039a57a2d3dad8af45c46f073e2f SHA-256: 0ddf9d0d2422cc97baa19f692a8b2adfa5f8aec13c1b5c1785ce523453686a80
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites, indicating a link farm or distribution mechanism. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with techniques used to host and redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607767b8f31fe---fafetosunomivuro.pdf In PDF document text
    • http://bajcsidavidfoto.com/_user/file/67855999044.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6c669e6fa69dc5b385a3db2eb3c1115f/xotomomiwilabi.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/761f5df0b744c603f0f7deba5dbc5944/64999265527.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16102cabe193eb---69188764938.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/91051310975.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a328ba6de07---99150871200.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/zivavowiperonutisu.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/fe7eda8144f7a06473ec712a1164d5f9/wezofezupufagi.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/53443071874.pdfIn PDF document text
    • https://ksboutlet.com/file/files/42397251177.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/jexubuliserut.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/6924576489.pdfIn PDF document text
    • https://p87.hu/files/55552825047.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ae43a8f4e78c5a53bbbb3a3450433d51/patesigijevakovesadujot.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dc29c9593743e1dfd83f6da68c353455/nafusivaxizapejozumolo.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/xodefazutezubogojuve.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/74d716139698d4a004fcb66a3d076b72/43599752276.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f59b286376---vizirewitupupajila.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/binuwu.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/53043422892.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f600c3aa0e---jodotok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=2012+toyota+corolla+ascent+sport+manual+reviewPDF 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_off0000b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AD 11096 bytes
SHA-256: f55b51a034c10a17a4e8d00bae9754f03632c9b5c50441a4c61259fa4b5ca000
font_01_sfnt_off0000cdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB9 14220 bytes
SHA-256: 0430cd433a1180c1a5b39f9cf8cae0995ab93aa73b612bc3bfb4702dbdf88c88
font_02_sfnt_off0000f0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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