Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc433e77cff3b3be…

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 11:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9b3428cca4a92980b2e977517c702194 SHA-1: 17d40c3f74ad536220184b9d0814f9fac3cf678c SHA-256: fc433e77cff3b3be889323a86f7eb17cf0e8a3864a544e829eaf99d8ffd72870
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • 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://synerhu.ru/uplcv?utm_term=h96+pro+update PDF link annotation
    • http://gowowdeli.com/uploads/files/kuvuzodowu.pdfIn PDF document text
    • http://schokozentrale.de/idata/64036924538.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/sipegisepuk.pdfIn PDF document text
    • https://hinaweb.com/upload/file/dojulefuvamo.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/81363507954.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/81511251649.pdfIn PDF document text
    • https://trexanh.net/upload/files/48721781926.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tbqcckijpb43ths8qfg2ftd6g2/nuxatanibogamogivup.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/a8d4264cf14f9a344b009c22d1c7ff9c/jodoxemekujibovimudur.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/55441640564.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090615103473499.pdfIn PDF document text
    • https://majubesar.net/contents/files/76519425309.pdfIn PDF document text
    • https://km2804.com/ckupload/files/nixasurazike.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c38b2df0a7---lagavalifafuretemafifib.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/4341pvejr0c7e5n3rnq6ninm8f/5645090787.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/miwikobabumativavawu.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/8edeba017fe389383c508b97f30a9fc3.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/feribifosetureze.pdfIn PDF document text
    • http://k1a.ru/images/files/file/48876057881.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614090509ddd6---28484690292.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140f2dc058fc---relaxipomitos.pdfIn PDF document text
    • https://geneolock.com/ckfinder/userfiles/files/buripimunebitizajovem.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_off0000b851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB851 10400 bytes
SHA-256: f225b99b6965b7a91fac1ea93a88d524a6028d0a9ae1480bf4b428b36f622807
font_01_sfnt_off0000cfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 16904 bytes
SHA-256: 61055889c577150ec6f22f5552b08a1fc6bed9bc09ac7df9cce0f5c3fb36c1a2
font_02_sfnt_off0000fb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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