Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfcbcdf8d2814d5…

MALICIOUS

PDF

122.7 KB Created: 2021-08-13 13:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e4935263cad30b1598e9f02efffc41ca SHA-1: e2d54c72b599d0cc84b9fcd52a25565e54d80cb6 SHA-256: 8bfcbcdf8d2814d5bafecb9d37f909fb7809cdd0087b6499b549cf3e0d72425f
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a QR-code lure. 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 0.9978

Heuristics 9

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://ipublicity.cz/data/file/midesiredoxubufadidober.pdf In PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c8e188c4f---2302292853.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607206f59bc93---vagunezasijixobaxezuta.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/zubiroditolemogepum.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/60159320480.pdfIn PDF document text
    • https://kristinanamaste.eu/files/bufudoli.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aae380295---48639490130.pdfIn PDF document text
    • http://northcity.rs/slike/files/fezaludufasivofin.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2527f27641---36680580972.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/kosexutaxawugazasep.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be520bc9ffd---92753359490.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/17546054934.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///87725764937.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d11dcf13e---80700896664.pdfIn PDF document text
    • https://kristinanamaste.eu/files/49792395906.pdfIn PDF document text
    • https://samowar.ch/upload/file/doruwujuzi.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/mufigopik.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/2523c1361a3b17b6197d817d7adfce62/sonupitebonoxexovamamal.pdfIn PDF document text
    • https://cpc-serbia.org/js//files/34702089680.pdfIn PDF document text
    • https://kenadong.com/contents//files/pozunozoforanadopazejex.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/wajopup.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2da46eeb522b0d07f4a865736bd3e23/nonalufusoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+secret+code+for+sportybet+balance+adder+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000183c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183C3 26320 bytes
SHA-256: 4731a6569a4d7c5dfbabda498e9036ed2af7790af52e702ca617f052f0a51b2b
font_02_sfnt_off0001c3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C3B6 10940 bytes
SHA-256: 458939c2fbb80f5f39a4a51445b8c1c8a4bdd5a5ff5baf293de1a84eb14a2b0b

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