Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d47a91418fbbdc6…

MALICIOUS

PDF

79.6 KB Created: 2021-06-29 23:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e64213e450f925bf2b1d7d82864b815 SHA-1: bd4ff163a80a2a832f18b48a810a06d7877fa68d SHA-256: 3d47a91418fbbdc605df9650e915f4d3f02d1e0729e0b55eadfbe7024a96a0ad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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://banderlogclub.ru/Files/file/posajopijijipa.pdf
    • https://nbtele.com/en/cache/fck_files/file/33437171878.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16088b558a7f10---wadinezir.pdf
    • http://cymrozgreatdanes.com/clients/1/1a/1a407d8ccac5525c71aaafb6b4664123/File/40697119050.pdf
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/3df1f6a49c4050e0b3682e319da5dcfa/1334678283.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/5cba3fithc28mtv0ij5f19r6rg/89312335997.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776563d5259---45597268308.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609adbe96e84c---gujowemubulinuza.pdf
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/1c1fd6ccb22df7296ac45808b52ed592/zaviwiwugu.pdf
    • http://www.jindatunnel.com/up_files/file/80030658137.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/gjpp0gn1kan44lhnhs5fs5u458/86401738198.pdf
    • https://thinkhigh-tech.com/d/files/86173409800.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091575c63cbc.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/86408340452.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609203c021b0b---sugutajunofawututodup.pdf
    • http://ngoinvest.com/uploads/ckfinder/files/66599023303.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987f87b1bcc---fotusivaxuxig.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16070003a80fbd---welifumiditaz.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9099874e---74757731088.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/vrqrui2050su6ribs8q5qjljs2/51073005602.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/i1v195c07tkls03s5thaesnsvf/tebuzulosexel.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087694dc67a6---70815908612.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f67971299---woxurevuzojipigajo.pdf
    • http://dmkaudit.sk/101/upload/file/87194233093.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608186d0a5cc7---lunevenepubu.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16077afc3f3c12---bizimebawonake.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bfd525420---3208568896.pdf
    • http://canhtoanland.com/upload/files/37421162291.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=attach+image+to+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b8.bin
2b473df26eca317132002288390647e403d5670779c676f7f5a92c2635d2c28c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B8 16516 bytes
font_01_sfnt_off000100bf.bin
6a82c2a494f245f8ad9782a0f54386c18ac763179dbe2a4b21b9d45ce994d71b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100BF 10628 bytes
font_02_sfnt_off000118ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118EA 16792 bytes

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