Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72059aa07fdc103…

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 04:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ee489660182fd4d398c628ca4e5d51bd SHA-1: a4f389a568ae94365ac247d24d5efe33b167d879 SHA-256: b72059aa07fdc1035a4b85ad1118c2fd750a63f33e83bd621c10b5f864f2346b
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 ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites, likely intended to lure users into downloading further malware or submitting sensitive information. The presence of multiple links on disposable or compromised hosting reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f870cf152812e45b7c5b606fc2fdf5ab/tanogin.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/jk6dv0c565rvbam90cn5c60c0t/mibumelonoranodedugaze.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/tizeradusulaminolu.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/duzubizalox.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/737a05b0e144b837126a0d42a4d5fad8/molov.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e0c607fe8---57720412767.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/69169208534.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b96143f854---pudedati.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/keredeje.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/69555913947.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/ripudi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d099f355---pazotigipavodedidekusoda.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/lakoras.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb43d3b0511---15110428363.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b34fd820dd5---96209595632.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/56c7f7e2ee942400c11b8853a5ee69e5/63897619718.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9187275ec7---powerobofadatoginesig.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/332rghs8gpksuleg21dqab8nnb/46320014885.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/0e089a8ee87077c7d4689d26862be474/gidotuli.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/95616191872.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730ca7547a3---pelivilinuwokozoj.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/93c4685dd2440ebec0b406e3d8f71519/nawikujugigebovus.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab09e7d171---9607178112.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075ab49039a9---mufoxugal.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/luvivunajowijora.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718ab80fab8---17382386806.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=give+me+an+example+of+a+predicatePDF 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_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF47 16616 bytes
SHA-256: c6ad2ca4e5eef6064128bbef1b282f167f1d9d67752a8fed8cbf013cd29f2de8
font_02_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 10820 bytes
SHA-256: 13e048b657866107b8cfc48c2a5723cbe0c569c338a246fa46bcf15fc6df644f