Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6958c9e0007a74a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-21 09:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4148599cabde028fd939b0ef16d97c23 SHA-1: 98c26c21cdc0625b0f1f1497226c57a31f94973a SHA-256: d6958c9e0007a74adbe03edd06fde0fa3f70b831ab75ea43244f62bc6bdf9d7f
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous URLs, including those pointing to compromised WordPress uploads, strongly suggests an intent to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://oniceh.ru/uplcv?utm_term=divaswapna+book+in+gujarati+pdf PDF link annotation
    • http://architettotamborra.eu/userfiles/files/2377795214.pdfIn PDF document text
    • http://unicorn-furnitures.com/d/files/97239689370.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/zafabobekalisesujugobewe.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/dikub.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3745a9c19---tujozewefu.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/metinejiroved.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/mokitujekogi.pdfIn PDF document text
    • https://bloc-immo.com/images/29801910054.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613001b79a339---sifoba.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/fasudomegugumukafageg.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/29662490999.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/f646ac5c6be6e4ecca9c5d0c13431f60.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/86831051729.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/5383829870.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/274ce85f5aafaa0afd517bab50b3dd4d/90002745214.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/ruxuvud.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/92347944509.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210916_6B1E47762EE61781.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/fikaferosunudajo.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/38936515450.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/gigolixapekomula.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1765099d---gepuzag.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_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 20868 bytes
SHA-256: c362de5968490ce3add0bdfa8a057c1c54565db6572f6582fe623726b54f9721
font_01_sfnt_off00011033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11033 11112 bytes
SHA-256: 316b81c804974d3f23be7e5b8ecd11cdcd6cd50da4d9c535a50b74856ffa0c6d
font_02_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1