Malicious PDF — malware analysis report

Static analysis result for SHA-256 864f166f5e179642…

MALICIOUS

PDF

78.4 KB Created: 2021-09-20 14:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1947656e389a496a8b4a54d3cfa6957 SHA-1: 8ad147e40e19b19096c66917784264a5537b5beb SHA-256: 864f166f5e179642f6661a4b313823bdf53a419ffad39afd4d981dc8f2c201b6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update to view content. Several URLs extracted from the document point to potentially compromised or disposable hosting, suggesting a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/i3mtv892dtr509enf9sn8k2ham/meloz.pdf In PDF document text
    • http://jjkxmy.com/upload/files/202109092348245738.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/nedunizokob.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/xorodorosatusizefepizijo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614224a2cb66e---64817096222.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/98236515752377dd1c60c7dde7dbbb30/zanitifovadur.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/87367129987.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/41651278731.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109150608295474.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/kemududa.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/41833769769.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/rapewatix.pdfIn PDF document text
    • http://bjjiffy.com/upload/36362751911.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/40965193325.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/1493110131.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109201842262962.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/98035797318.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/30994782847.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/bofetatowes.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/2894059121.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/gudatajusamexatonotomewuf.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/66243814920.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/46130392618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=7+effective+habits+of+a+teenager+pdfPDF 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_off0000cc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE479 18028 bytes
SHA-256: 03885dbaf723126c5d4593903cf8b91f1bc2752cbb585a3083c99e793aad6f0f
font_02_sfnt_off0001131a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131A 11012 bytes
SHA-256: 27ebba4103f9a0799bc238177973d8101ed870fc6171942d01479059b728c183

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