Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66ee7332e60a357…

MALICIOUS

PDF

107.5 KB Created: 2021-08-06 12:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b31731a9cd1606bd9f6b0a0b68aaf1b2 SHA-1: 0aa4e14b7ede8dbee8b3da51663f6d7f5711383a SHA-256: c66ee7332e60a357fd7c8e717d5662b3985ea8b311fe1cc47b17788faedd74da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://nomylo.ru/uplcv?utm_term=does+mold+cause+tonsillitis PDF link annotation
    • http://phrabat.net/UserFiles/File/57888408387.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/zumenorerano.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba30d0eaff---84177502329.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061216300473499.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/87c721fd5393e184843b6b2e79fa9a37/romodaxexowasebep.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/rafogovazikubavomo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/r3ean67vmqva1uuqavuqdk0bp1/folakupakakafifilir.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/499839a652e6beac62a7278292a37b00/54891497165.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfdd669168---9878076718.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/luwezegaxowumofapisow.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k6qhr5gcetlm1cpp8gibp15i76/dinonegapiwabaloguku.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107100858062352.pdfIn PDF document text
    • https://tavio.ru/files/file/66168953654.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610313038e229---jadowaka.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/3dbd5f8dfed94f348e67199a8c2f7f9a/36704219003.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819b40ba98a---22865315340.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/biteso.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608283c193bd5---94532834347.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16097f73a90d48---gefirajereropafonadano.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/feramugezewosidu.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/jezipisukinisezofu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/535d891d19b2e763570cb49da290c4b4/tiwexatatago.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/05a89e2af5d6320538b3471aa27e4a83/sikulu.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_off00013e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E0A 10532 bytes
SHA-256: dd6a62d7694a9afc8c0fb25253da05a4a157dd9cb3eb9b08ac599f8bdf7180e9
font_01_sfnt_off000155fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155FD 18056 bytes
SHA-256: 61dd0aa91e7abccb781e4cf191cd7ec504421dc2b020eecee3c7605c9f2fc677
font_02_sfnt_off000185b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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