Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c55df7c131d8426…

MALICIOUS

PDF

99.1 KB Created: 2021-07-23 05:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f5aff38e09479e95a4d21a9183c95464 SHA-1: 4db2a44f133bca9b4b974d1c1cc477c736c17a96 SHA-256: 3c55df7c131d8426ca5d45c560dbc2c034bf1cbc530dc6ff0221f4eabe1dbe89
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive lure' heuristic suggests the document is designed to trick users into downloading an encrypted payload, likely to bypass security filters. The embedded URLs point to compromised WordPress sites, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6bc70f2a2ff5de90d7a56ac134b5cdf2/famir.pdf In PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a62cca9d0e7---tanixidimaxutewijo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/dd075b984819a21c8cd4acec5c4c2dd8/97771962647.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f24f6d16d64---79386131946.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4346d8ece0198fb3ccda9392690ac6cc/roferiselofowowusakazab.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0faf700678e6beb2031bdc6ca72d231f/megisawaneteboxudijizub.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe816baef---35921573736.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/34016484516.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6dcc10fc0---bizubo.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/6945575662.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ee319b346---wejonotetanufijojesalaba.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/xukepanevinoposeza.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/6s2rp4h662m2rvdbnn3fpmv6vp/rixepoxixedenowufo.pdfIn PDF document text
    • http://tulga.ru/editor/files/zoxepoxu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084082c063c8---84271471708.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607912706fc7b---9945876251.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa578216ce---nubitavalupofosuletadi.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/xesetemufomasujimire.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/77718607092.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16099bbcdc25fd---96792069220.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/lokapadopevezegozena.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/208014f35c4f2d80dacf09574225d4dd/nokobitoloxijuwuxij.pdfIn PDF document text
    • https://unosms.us/userfiles/file/desilikunizi.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c08069169b3---fuwiwurap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=semiconductor+physics+and+devices+by+donald+neamen+pdf+4+edition+solution+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001581d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1581D 20672 bytes
SHA-256: 151fe55251e190cbbdb1a34aed1a1707063edacad1216b8d1f182f973be73f7c
font_00_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 11456 bytes
SHA-256: 8bf66f60da1b385a2c83976f05a0f1df43a54d5f1c957d574c046b9752ad4c93
font_01_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8F 17360 bytes
SHA-256: ebbb02ea98b738149507ab418440ed6a631e3ec6c3240bd8fe238301cd0ddee8

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