Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4a8e8ab863a45e…

MALICIOUS

PDF

93.4 KB Created: 2021-07-01 19:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: d2d165ca845a342762b13fe07855c307 SHA-1: d36e383251302abcccd5167a12c71a853c2eb8b3 SHA-256: 5f4a8e8ab863a45e8645c6d35facee461bf29c141adca518a17f3ffd8bdbbec1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://queure.ru/uplcv?utm_term=6+canons+of+chinese+painting PDF link annotation
    • http://koryosushi.com/uploads/files/bigebujopozerinel.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efe6eab812---luzijaposifavilobizudo.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/32361449353.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/kidujumiwevot.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/dfc7d93651ba39d4b38efcbe017dd0b7/67184084891.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/tabq3pbatm9e2cpth2lguljt41/43700311606.pdfIn PDF document text
    • https://promise-land.com/upload/file/guwavumavofesosovegagu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/9erfup4es0u32nj8v1g9n0e0dk/xefumewojunebu.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/78661295432.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3b65574df---58168623149.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/lulosigekufinakusijiliz.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4f1932747---banegotewik.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608804f31ab3c---25320661609.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a52c4946e---42646388833.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b446ad2aa1c---60767369685.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2cd3aab1e---xanorimexeduxugabeje.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/tutitugepadozizarepemi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ad90f6ace9441d9216b3cd54895cd6a4/gozov.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/29325388057.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef064645d---mevaroxadefosofeb.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/6e71475ef7813b5b2439baf99c372322/19671385406.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286e71a70a---22895544683.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/n3el60n82sffvhvfpgt22um1qb/javigewijutirazixugapol.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/640842769.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF71 18284 bytes
SHA-256: ec6e4d3eebf4829cf24e306e8c9bb3711f45c8330bdcb80207ba38559415707b
font_01_sfnt_off00011dfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DFB 7608 bytes
SHA-256: ac984e7e56f7865a39580827f2da81f8e89c0f94b41a5ab7c37d3f8e38217548
font_02_sfnt_off00013714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13714 10684 bytes
SHA-256: 79df90e4d76689ff8abb7f6d60f5596d9e365c37f428e72c13ae190fd00d72ed
font_03_sfnt_off00014f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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