Malicious PDF — malware analysis report

Static analysis result for SHA-256 6575ff3fd5959e9e…

MALICIOUS

PDF

97.8 KB Created: 2021-06-26 04:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d70217d6da5715ba5b59d800c234c89 SHA-1: 1193089b6e16c9e98a6829c61192e24b3bfe3937 SHA-256: 6575ff3fd5959e9e9bb24236f2661e0d29cfaf5a934126c8d578e24abb414a81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to other PDFs hosted on various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=the+expanded+octet PDF link annotation
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/58c81d698d0290ceb7b31bf96b46c08b/zotibiritof.pdfIn PDF document text
    • https://zold-kommando.hu/files/47367236550.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/nivipabebevugilixejab.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/fa80021ac70178d2dbe143cb9a4bff56/42855220272.pdfIn PDF document text
    • http://santeh.md/img/files/ledawuvawajozomi.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c6edd370de742c73523b823cee5149d6/gekigusol.pdfIn PDF document text
    • https://aedwea.com/upload/foto/91425376445.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/67165120592.pdfIn PDF document text
    • http://keacg.com/upload/files/20770758723.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce73e0a4c---movulad.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0d2a25882---9344506811.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/01fe4c7427fa52870a53a0b3a930d4ca/85363472455.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/72286565160.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c356f675cda---giripivawegapu.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/41060315954.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/a6d39abd7d966bb169dd89c03019d9bb/penanuvamivowa.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/64441393315.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/27502377223.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/welabuvisidanosum.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f60791f0---bixuve.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/4724302339f210fe7f483dab3ca1b3f3/68222220048.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/fagasovavopawirudeduzeb.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c89ae30f635---sagaz.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/n54vlrkeutff5420qjjcipj8a5/mewipuxevodozef.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712c696291e---zolugojomuzetununavizaxu.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/lavefob.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/529b7190bb480aa16c6ad803afc22087/11030869462.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_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 18932 bytes
SHA-256: 5bc7c04be89f2d944e7d207ebbac8ddc96d7c141487275498d20cba952267cb0
font_01_sfnt_off00014ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AE8 10268 bytes
SHA-256: fd499e5f8cf6f606a39b15560522bca46f117790f6fdb4f55510ef0dfdbf8e83
font_02_sfnt_off000161f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1