Malicious PDF — malware analysis report

Static analysis result for SHA-256 20e4181ebd4fb4c2…

MALICIOUS

PDF

84.1 KB Created: 2021-08-14 22:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bce4527acf294e282d6f9a57e38c6157 SHA-1: 591acd0ffcaa1dedc5556a457a183ce1aa193464 SHA-256: 20e4181ebd4fb4c2bf2bea3b3eb44c3de2974441916d54a2e0419cc8f03fc218
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting. The presence of multiple external URIs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6s525rqurqp8m343uohjf5di0/1788218261.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf850e5ad60---wasotonuzuvo.pdfIn PDF document text
    • http://kinocosmik.ru/sadm_files/bizaronagavokiwalabifi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa99781e291---zenifefojosume.pdfIn PDF document text
    • http://parentini.it/userfiles/files/xawabixonufovoja.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/g5tme85c7m39ohki8t3ai4hcqj/lereselakabifusajuputepi.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160779c19a8275---nemuvakegevuwolajatufusif.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/dudikometa.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/87853428411.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/fizofikixewurane.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071364fecffe---wenojamodutunibuduvaxibox.pdfIn PDF document text
    • http://dongfangguohua.com/ckfinder/userfiles/files/4733117335.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/49162935422.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/71078170649.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/6701589350.pdfIn PDF document text
    • http://ldbell1965.net/clients/85689/File/25333887052.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087080bed12d---29353792164.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609eadd78dcda---50444543975.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072baf35a68e---lojuduwadozojoweniv.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/73624a88970ae49f2b4500126958ab6b/91534199953.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/493aa11d96c38a96124175d0f864b630/lebotadezegofasuvado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=usindh.edu.pk+marksheet+2019PDF 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_off0000e152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE152 11216 bytes
SHA-256: 278e03b6e4b251c0ba600efecfac1b9da65e76d7eeef900d6747b7d22aecc066
font_01_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 17140 bytes
SHA-256: 05dd88acb3402749a2cf83562cfed59922fe111da7a23db138d3048f9286cef1
font_02_sfnt_off00012877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12877 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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