Malicious PDF — malware analysis report

Static analysis result for SHA-256 925a42a5d115eb95…

MALICIOUS

PDF

76.0 KB Created: 2021-06-26 19:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c91ed3af4c7bd99c934d456879e63311 SHA-1: 7f3fa13d42a32ac0e572e614949ba57f52bc434d SHA-256: 925a42a5d115eb95e07399fb7745ac8f60c697fb7f1d6837dfa87532321f6e54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate that the primary goal is to redirect the user to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cf9ad2e2df931a835cd560286ee4267c/nozaxomejokewewajowab.pdf
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/iv63ag9kuh4159ghp8ihhe6d94/10260347233.pdf
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/jekovuwudazupav.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9e8bc064f---73277173504.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3e27d9b617eceb348d3ae50bc9ee4c68/mawugupipodesupajufesos.pdf
    • http://escqatar.com/uploads/userfiles/file/file/suvodaninakasepupu.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a770c5d4fd5---35057119587.pdf
    • http://ddgasul.com/userfiles/file/25601664396.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/zalimopix.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab260d307---funonimivodukox.pdf
    • http://madang.eu/f_pds/fck/file/lixezudafafapopukegigal.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7ebe50c77---laponukovudop.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ef2ff2c52d2c3749bca96c0a01681b5e/vukinipip.pdf
    • https://paperland.bg/uploads/file/zusenuvomagi.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/7e27574756f62b1842bc1c119d322a31/1831991536.pdf
    • http://adance0112.com/upfile/editor/file/fupizapovobune.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5b0c67129---rixeba.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/97d9bfa4aa86c384275a5d39f585c230/lebigorexukope.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0d0fae87d0703873a4e2c0e6b7e0c5dc/13950333056.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/v0tr7e5l4d0up0d4mgve1n57h1/velimixidasajo.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87197e67e6---gavunanepateromagejip.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825c6ca839e---retexubuvejudeditapo.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e29a6453c132c8791199f0612bc6bcc7/50719173543.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=since+i+was+born
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8a2.bin
356d057a457dbabc5f2979e0744e697344ac4e2e937a3ad7686e4dc22bc97992
pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A2 16780 bytes
font_01_sfnt_off0000f35f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 16792 bytes
font_02_sfnt_off00010b76.bin
a64869359e17c3b7a62a73019577243f513590a203b4d81f31270d5026d83fc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B76 10380 bytes