Malicious PDF — malware analysis report

Static analysis result for SHA-256 86156456e2377371…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 17:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 640c211047c9c5182a759a89eeb021ed SHA-1: 8e227e46fddfc7913b52e6476af22b6d90c0ca38 SHA-256: 86156456e23773712a1f41abe5b9757b252fab93dbfed3c941059090b22f8cae
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting the document is designed to redirect users to malicious content or downloads. The presence of a visual download button further supports a phishing or scamming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=where+can+i+download+chinese+movies PDF link annotation
    • https://cafesca.info/ckfinder/userfiles/files/xogufivasewuxafajas.pdfIn PDF document text
    • http://ailizia.com/userfiles/82499706427.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9abb4914e---jevisivabaxemirenisu.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/93250787505.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/pilatiduxez.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/xezibiwifurikala.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/34820286708.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wekatamatawawopizedefos.pdfIn PDF document text
    • https://tspinstruments.com/cache/fck_files/file/68248896140.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ihde3s4j52tqrl38pg76qvpm9q/77448381649.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/ropadenexalimaresiwik.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/21090612474886481198dsds.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613495ce4a99e---mujujivurekewiferoguka.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/xibagukibobekotilud.pdfIn PDF document text
    • https://nieruchomosciprzetargi.pl/files/file/bigidizir.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/23931463273.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/zipalewiwudaxibodif.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c98c477974---kineb.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/xetalaruwozalevagamekube.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aba174dd02---26572804438.pdfIn PDF document text
    • http://space-edge.com/upload/files/88095459823.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/8853675551.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/7185679156.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/refagivovodosoxipumeliga.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_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 10680 bytes
SHA-256: 0fa7241278b2842ea784cc61667acacce4445cf028bfe78ba8a0872eac8ed61b
font_01_sfnt_off0000fef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF7 17468 bytes
SHA-256: bc193be8f1eb31de91c90bbb4b5996730bbe3f918319417a7781e0d5f23d3313
font_02_sfnt_off00012c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1