Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc729f992f9164a…

MALICIOUS

PDF

92.8 KB Created: 2021-06-25 13:28:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 04d7f5f458bad7057e720af8fd1d44cf SHA-1: c8ec6b7c4729b7602eb3756ddaf4da660a39142f SHA-256: 8fc729f992f9164a98c154fb230890364f1962f6e83c91d93f1b9593a7f92441
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://capecoralliving.com/media/file/7992533466.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b583444fd9---tabivaj.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1acd847a9c0c4ec5bf1ba9f6029fafd6/50988931965.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609696dc6caf0---kilaz.pdfIn PDF document text
    • https://proxus.nl/file/55552132723.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/wibiretilixikevifalexefe.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/71752394931.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/dujodedu.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/389489bf373bcd7ab9371e674d6e72eb/51345788621.pdfIn PDF document text
    • http://alkanboya.com/files/file///mimafomefexusu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7052e1bfaad86abaa84e58e0acf225fa/woxibigetew.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a489399ea8c---13044043540.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16084f93ceb03f---20361942386.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/3i66c7tnff1ti0k568mmkuquis/xapapupusobune.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/wuguxelix.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/63483916353.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/3gupkua3do3f5k12jp7174lisf/11442352097.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hm+deleter+fire+redPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43E 9952 bytes
SHA-256: 4aebd5721a8bf96e17648742f229744c8fe2d5853934034ce4251df758554652
font_01_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 19868 bytes
SHA-256: d3c91618508fd4fc1c3a791e6776b03924b1d30f0757dcffedd9b716e2f7a98f
font_02_sfnt_off00013bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BDC 4380 bytes
SHA-256: bd57c3a762a5c973a74f174126461faa5c6eb0f5ddf8a81e5c42048420fef0f5
font_03_sfnt_off00014c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1