Malicious PDF — malware analysis report

Static analysis result for SHA-256 85878ee274370f81…

MALICIOUS

PDF

91.1 KB Created: 2021-07-03 07:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7defab97902ce41660842a4fd678e825 SHA-1: 90f1625a99bbe32177a4223947b64a6ea2d703ff SHA-256: 85878ee274370f81b883f42be2dcf688cecb23912abf1a4ce98736beca140524
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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=the+lcm+of+24+and+36+is+48+and+hence+find+their+hcf PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099805f7a6a4---donaxo.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/11021659743.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968f80d968b---25881131198.pdfIn PDF document text
    • http://sam-global.info/files/file/26757360565.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077b695e7ee2---pilapod.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zaxotetu.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/56007768563.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/firilogamefusujomifigato.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/47263296269.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/78503372342.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/rigigumojiwadomobefugepes.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/vozaxawibumipufa.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/f332255874670f0f17790824e2944f33/51843756398.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5de1ebb7169345ff3b55ba3ff4afeb02/depas.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b80d3a9c---72604647601.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/6m57dmt0ddnjv11e5ouulmjs66/wirofesop.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/973b2ff5338f3c9a00dd35235289bb83/nitomozapumexa.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/116255fa2fbe4fa4017fa305643f6307/25195945783.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1nl5ck1cgu4iqfh2f7bvt42em/tikawe.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/m6vkckaabu4vl93a6g38p6bq3r/8666136365.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/325ab39d369a8f4081c3ccfe8353e42a/23992963709.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7e4f519292c667db1027b580e754c5da/zenokudaxezu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088706e5bd8c---riziritisilafumeve.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_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 16888 bytes
SHA-256: b0841a26008449ce74ee5293f4953a61935fb58f8855788ec68b9942910eb2f1
font_01_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 11452 bytes
SHA-256: bab9ee8fc2fdb2652cfda443d6958963aa48ed524df75979bd256b0a0f28284e
font_02_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 17316 bytes
SHA-256: ee576417aec0615d7e42e81415c931586bb5feb901f2608a746c4f5e4257f1ef
font_03_sfnt_off00014432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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