Malicious PDF — malware analysis report

Static analysis result for SHA-256 b496f38142eca318…

MALICIOUS

PDF

69.2 KB Created: 2021-09-03 15:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3077b4ba795478723bd1657186f99fd0 SHA-1: 8aae935741d597f12c49d74653768beb93eefaac SHA-256: b496f38142eca318b3444e2479afc0b54e1633c23ee41a23d38f959fd7e30784
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, indicating a phishing or redirection attempt. Heuristics suggest it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/59c84a14ae8ec4646f3d2f1631138844/dafimugitula.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a253b268c---tetibujojirufogogarilit.pdfIn PDF document text
    • https://x-software.cz/data/file/30114205381.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/7c93a28cbef2e30fc706305b88f09825/4342125459.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608da9f4ee9a6---23414865173.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dea00e038---30078598941.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac177c823f9---bojevisavunij.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/33766033151.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/60475186558.pdfIn PDF document text
    • http://workontext.ru/media/file/92461287391.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160916bfab3707---57157682444.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210727224709.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/43060470662.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/15936265573.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/03646e1f8b6bd6ad70773c8cff06524d/taragoxosu.pdfIn PDF document text
    • http://sous-mama.org/userfiles/file/14874660170.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/sigenoxeresijosowenis.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/18128409676.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/lizujukibaxe.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/34263845727.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/wavidabotutaxipitip.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/85027049615.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/dc90e3776dca4bd6cdd6343b0fc447b7/83878295708.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f38970200---62733765906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=abba+mamma+mia+lyrics+pdfPDF 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_off0000b3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD8 10560 bytes
SHA-256: f0ca8031e146b4dde20563fa9ef6e4191a28a9bee0e98db3695b52f061215215
font_02_sfnt_off0000e3ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AE 14412 bytes
SHA-256: 5d77df869a8a4e6cd9f5c3b99d5fbadc1bd23db1cf976831d3b360864dee9142

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