Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc88b66b7df7543a…

MALICIOUS

PDF

88.1 KB Created: 2021-09-05 16:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 489f6a1cd041af92b1260fcb5c5d1413 SHA-1: 09bbc8b49630717107151a001c08ce99d0d67e78 SHA-256: cc88b66b7df7543ae376ec7deea58cfbe9a13731ab75bae5cd7ba868cfde2fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm to distribute phishing or malware payloads. The presence of external URI heuristics further supports this, as it indicates the document is designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=canon+60d+tutorial+pdf PDF link annotation
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/96016745614.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/42192602102.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/19aed631ae46cf291f17d3deb650edda/94213051038.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/43807086077.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/83960541767.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d9400c91---76961391197.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/wizusuzove.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6ph1ngkbh92dma8pto516robra/37665245463.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/18956362048.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/32933255280.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16128df478f99c---vavaluma.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/2b06aec8141989a3e31f9f06daee3ff7/widapidokovobak.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ed3216bf8---devegojigulodadiz.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8db17d2dae---pubanutizokegomeja.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758ef29c421---fexakewixo.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/76317792811.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075fbe4475f4---3987261672.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///70637775135.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/afb2a6b88025f58ba3a33df22d4e079f/lowuvofufi.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/45390190751.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/674216426113f276d2109.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/regajazitabunotemotarako.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/vakutazuji.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/54245237775.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607096b4b769d---79391293066.pdfIn PDF document text
    • https://frisch.ro/files/file/kiwefitujosifano.pdfIn PDF document text
    • 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_off0000f264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF264 18628 bytes
SHA-256: e863aa5443d25bb3b1bc2e569e95eddf490d40c2bfd037a85104697768b73842
font_01_sfnt_off00012216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12216 10612 bytes
SHA-256: d4f2189f7d283e6672eeb5f7c829706e62c25085b00ea367aae5eae9fdd0fcab
font_02_sfnt_off00013a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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