Malicious PDF — malware analysis report

Static analysis result for SHA-256 00f82e4403fed78c…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 15:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 942f3cb6c08ff318664732b7e3894eaf SHA-1: 9261ee03cb5b8b04086f4a7008d9afad377d1176 SHA-256: 00f82e4403fed78c69f20552dab4f957e3fabadd4a796ea2c78f17db56ed6165
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that likely lead to malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are spread across disposable hosting, a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=crab+drawing+for+kids PDF link annotation
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7h69jvh11napa16m0vei47383m/nomozimazaj.pdfIn PDF document text
    • http://wwstationery.com/files/file/pakamenuxi.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/a09e549ae9cf184d7fd58970fe828136/sutadakomat.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/vewerunikakanoso.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c8daf147---lezipuvixabu.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/dncut837r1goi3nb4nbrusbrv1/19032028307.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073285a402bc---74567536352.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d84e3af39a---nepadosuzidovaxepeluzum.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/21q44v4vn37848n8d1j1qsrodr/zolevuninalozi.pdfIn PDF document text
    • http://carszana.com/image/upload/File/99223602715.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/25904016543.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdff5cae08---nosurijowoputos.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-24/20210524012329390620.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2efc69ba1---bowexowige.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/feb123bcc2743cb8a9d775e5b78579b7/lomakadilu.pdfIn PDF document text
    • http://geodez.com/pliki/file/45528342345.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16074380e395a8---pajuluwanofixijevinonif.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc207b1e65---burinigexeponiwuwu.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/96b68641f0c40ac40ad7a8af4ed724fa/5545213345.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/e7394eaollri2v0qqc2a277n84/65732204822.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1f3e2dd4fc2006b13f2f896d42933b46/kixefikepub.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/f06026749b72e95c38f1aa3c582b2006/98283768372.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9201099f6---vegovagerarinolepuzo.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/139412b61f4051d11a63faf6199f3c99/64779554493.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/64deef337c6a6613b18c50b32f452561/midapiwinut.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_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 17276 bytes
SHA-256: ee040f6d1aadd378ad336463e76c2735f982913601bde69f60c46340d42bca46
font_01_sfnt_off00011d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13536 10600 bytes
SHA-256: 31ddb3591222698345b3c534f0e7f2fd6a4221cdf2219ac26c61dff446985410

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