Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b23cc73b1c45f3…

MALICIOUS

PDF

98.4 KB Created: 2021-06-28 05:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: f91d3048cbcad4be64fc0d7c63b066d6 SHA-1: 0e335a52c9c3da807e6358f9d7f8aa4848d7e57f SHA-256: 74b23cc73b1c45f37c7e9898e8677361d5ea0a32f21c61c9697b2209508ce161
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. These links likely serve as a distribution mechanism for phishing or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/87acdf73261b19b48b3ac813c9bb7d87/193015730.pdf In PDF document text
    • http://icltindia.in/userfiles/file/vejos.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/nurusarisew.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/84111045945.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb1d7946f4---36332787096.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20c4a4797---34328694400.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c9967e0c0---mosisejujinevolurejunuduj.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/piluf.pdfIn PDF document text
    • http://ahchala.com/img/file/8042387604.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0326dcba29feb299efdf7be7be0f77a0/26986161293.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/7108cf7c9090ce41ccaa8ca88260003e/56141769909.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/namexagon.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/0htum309a1ek18l8bqt0l5jem8/gofaduvaxut.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c873dc81f4a---zitevizedaraguzu.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/zopebiderimakuf.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726582935fa---98206028546.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ir801gs4ian9iqog7ccffdafkb/pirukax.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/710241315.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/4c27cf8f139bf92f2ebb116099146687/wovetozevuxovidid.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad96d69e591---64716503964.pdfIn PDF document text
    • http://didocrosby.com/imagenes/file/65936162121.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/5caf1e16de71bb341ab2678c63afdb32/24089117482.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/27e7509f2dead2ed602dd07c4e9a86b9/tumababibebipilagikeladul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=first+touch+soccer+18PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 17420 bytes
SHA-256: 45459c0884794e7310701831fa03da90e11f94ff5c1785631d070498d7f22411
font_01_sfnt_off00014cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CF8 10352 bytes
SHA-256: 6560049338efdea2b38829b1243baa183ce17ddc82c10567371a4b448c923e51
font_02_sfnt_off00016491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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