Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ddd23188baca8a7…

MALICIOUS

PDF

89.4 KB Created: 2021-06-30 10:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6057ece9f8dbe587398e119fde67574 SHA-1: 07fd24b8b47f396eb7274cb9908b3c3a618d67e5 SHA-256: 7ddd23188baca8a7daa554cfa32ffa4639ff8f5f71b4e2b23186e25508a992fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised WordPress sites, suggesting it's used for SEO manipulation or to host further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d7ecb16dd---gowexave.pdf In PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/00sfnqc3fn4176gehlm2aus4vh/noxewusuruzo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bdab0861e---dunuwoge.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/cprl0uu5guba94868pk9b01ll1/vovobive.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/depagozimufukukodaje.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b14122846e3---51701934982.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7c33d6707---35642032014.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/79978434580.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16078816d11137---40262702285.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fb5b91743---69648570452.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2qvtlvhrbblb5i48lcnndie5ri/zilixifegutufopis.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/66597472768.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a8afb7f4f---zinovaba.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/25233832387.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5ba47a0fd---69379011982.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b98ddc609b44c50d5f7044081ed9eb7e/negofadezegizotemox.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/xiduwejegetepaliwunom.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde1b76fb7---busibaz.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/32aa81ac42c3124a002d52e1d3ce1462/zikitenilevugi.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/0f1a043373e5def2c1d9cfb4be451f89/31011766222.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/puxunaxedipatuduxi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fabe164fd5---70821222493.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb43437be---91894214713.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/4097320fc120ba74496e3fdd7d771215/54789188867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=toyota+estima+owners+manual+download+freePDF 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_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 10780 bytes
SHA-256: c8b989b6a1df70cf566f25b611d024f328d10005c124626bcadeda28b1a06643
font_01_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 17900 bytes
SHA-256: fe83d030ae2c103116d1c1c13968a1871cf886809b2cc9249c41ea55f6603f6f
font_02_sfnt_off00014026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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