Malicious PDF — malware analysis report

Static analysis result for SHA-256 b45d69d5ae56e122…

MALICIOUS

PDF

120.8 KB Created: 2021-07-17 00:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79f36c7d224dfca1773cfed9c3913393 SHA-1: 80565185d3516a39ccf4cd4786c992955a0721b5 SHA-256: b45d69d5ae56e122aff4a8a074dea36cf37673ba6822fbc7430f0cda1d0eb245
196 Risk Score

Malware Insights

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

The sample was detected as a phishing trojan by ClamAV and flagged by an ML classifier. The 'SE_CLICKFIX' heuristic indicates the document is designed to trick users into executing commands, likely to download and run a secondary payload. Numerous URLs pointing to compromised CMS uploads and disposable hosting were extracted, suggesting a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4386ad9576b366039691ec14d7c06907/busumudalurasipidiba.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b222565e0d9d4ca29c96f583e63f24cb/39094931705.pdfIn PDF document text
    • http://geose.ru/userfiles/file/75459582086.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fovomamagatuwu.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/11833097828.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073283cbe3ee---33383065413.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/26e6b6550a624cff50ca9de9c1a72fcb/fomulugigotabikuxupipa.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5009ba261---magaso.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/19b88e993c107cf054e436fcb1a01bcb/94374087262.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/8fdf8053f4b8771849909b4443398d43/gufobumeso.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/gixerofidugisalonagajo.pdfIn PDF document text
    • http://dgjst.com/upfile/file/22874868965.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c259b9bbe0039ef8459357589a8cede4/xijedepog.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/9760473621.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2d01acfeda44a4e3cb657d47a53c42d9/80865271745.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/tiletel.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/62788146141.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/099c5abbed6c54adb24f37ee5fedce9b/bexorobopojidunoxaxab.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/42355fa46486bff64eaa44c6140a2171/58903355801.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/64d55202fe473c69a9fe6815aa5400b1/20135057951.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/npfn4a25jeae2unbnf7vaa3fb3/tuxaf.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/gomegeligujexuzobudune.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082beefb95c7---punuzom.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/sogotekobefetatufozem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=accent+grave+in+wordPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F0 10464 bytes
SHA-256: f781aac13b93fed32deaf11f53c100edd713c8b67bb17c774acd515879dba205
font_01_sfnt_off00013cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154CC 16580 bytes
SHA-256: 007edc8fba63b22df86694deb6214b5758d4018dd617660d05514cadb0f38a3e
font_03_sfnt_off00016c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C04 1768 bytes
SHA-256: 729e119ee6c2775e17ffab6e667b3562c8e63f987c26fd03a61df2270b02cf27
font_04_sfnt_off00017475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17475 48492 bytes
SHA-256: f6b89b74ba69a86136a294ac896b62d7fa48d8b4391d10506d290eaa8b4609c9

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