Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8b5785da649380…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 01:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a50a44b93db5f6a07f16b74bb9f46f82 SHA-1: 8849bc94332161f77ca30ddf8637f5abdbd3c073 SHA-256: ee8b5785da64938043eaff16904e67389d5b04c92d7a2d7c0cc468ce85da3516
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest potential exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jmvlpslimited.com/ci/userfiles/files/jidowotetawefezeb.pdf In PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a16d50013a---zugarezejubodakexulis.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/20745494584.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/95402970171.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/92614417953.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/76be9ded8f04d95e621dd57f38a39c1b/19750586788.pdfIn PDF document text
    • https://medtek.vn/storage/file/padijimexilopexez.pdfIn PDF document text
    • https://hirurgija.me//files/15153753825.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/nufurapewaguwolozobite.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/25acb3c9a187f041254374696b74dba7/38798166224.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/badofetisunu.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/95795225753.pdfIn PDF document text
    • http://grabnerestriche.at/693916185.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7adacd966b---25908569325.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/bijowukesojiwifakikefotaf.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/94342634644.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/80879067254.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/fetanisudapu.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/92875673628.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/3023fabc8ee97066e435c7c95bb22cb4/norukekuvidov.pdfIn PDF document text
    • https://chptravel.ir/data/file/47024345972.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/jojodapokibifiremarojubum.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/6d0cf73b24c605df4dddf2a2a2bb4f39/29567468918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=vajiram+and+ravi+geography+notes+pdf+2019PDF 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_off0000d7d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D6 11640 bytes
SHA-256: 092185d9af5873317165389d5c96bdfbb23115615effbfc6dfe0856f58875c4f
font_01_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 17620 bytes
SHA-256: 1f4b0f09483f0822c94dd58a1bad63e5663c8f2bd9a69400d0ba1eda42e405fa
font_02_sfnt_off000120b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1