Malicious PDF — malware analysis report

Static analysis result for SHA-256 7af2e15241e89132…

MALICIOUS

PDF

91.9 KB Created: 2021-08-06 12:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bcd3151ffc5ebfdec4cb06caf850428e SHA-1: 5f471ade8e95ed84908a29d959d249558ca0e54f SHA-256: 7af2e15241e89132bf870758b78f5da55178345cbec039cbc576f19432d89ccb
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and external URIs, including links to compromised CMS uploads and disposable hosting, suggests it's designed to exploit vulnerabilities or lead users to phishing sites. The 'SE_INVOICE_LURE' heuristic further supports the attack pattern of using deceptive content to trick users into interacting with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://infrive.ru/uplcv?utm_term=how+to+fill+out+a+3+day+eviction+notice+in+ohio PDF link annotation
    • http://artstudiodesign.it/userfiles/files/33266206187.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/zadob.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2c4295512d1d4f465ec3b095766b1bb7/nizipojajirarufewejuwupe.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210731_A48689D9DBC1C030.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/93383495219.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce61aa12f---bifopuzot.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/29a2419a9dd26971f36b8feeddde9a01/wawimadabelujoroluvexiz.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/roridijizedafosuwim.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/61818507454.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/126a11595cb39e635a95ec997e8337fd/susexavab.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/4261ec07e1ab6886b60412cd253297d2/dobasu.pdfIn PDF document text
    • http://www.trafikyaren.com/wp-content/plugins/super-forms/uploads/php/files/3qb74ihgv6dd51t40kae9nte03/doximusugolinemazu.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/46843465823.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/zebikafawosatidovunu.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210802054303148.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/19154583782.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/wuwiroboxatodogetapada.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/18b3332f84dc37ecf50579202d231f96/59703631620.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/17387841036.pdfIn PDF document text
    • http://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/gogidupenegi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fae794772---74259943387.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/1f88e4deb8fa064aad10aadba6fe0e3f/rukelo.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/fubuzatid.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/2da934666f2de3d800a8739b64cded0b/58336281092.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/v5rrgoj13k1lv9a7n451fqkl49/rowulogepudi.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/33006864459.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_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B59 10832 bytes
SHA-256: 4831fc115137af6048b3fecb023681553eece135931d8f0305b5ddedccdf9759
font_02_sfnt_off00013451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13451 17008 bytes
SHA-256: fc6be700bb82d407b0b0b184c83af6c4aa1d5b180a7f9c9bb4b99dbd2216107e

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