Malicious PDF — malware analysis report

Static analysis result for SHA-256 de85cffc3ab2a568…

MALICIOUS

PDF

90.1 KB Created: 2021-08-02 00:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 69fa40a5a7164c0df7c157740015756b SHA-1: 804859a555a7a36ffe299f408a6783b67eacd496 SHA-256: de85cffc3ab2a5689dfaec4ac0cddec39134008ac02be51292592135ef76eca1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, as indicated by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://farmaciasacoor.com/site/upload/file/vijufarasazef.pdf In PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/05bcfa2cd03ac63bdaf68f881e8b5cf1/zasivurevuxeluzax.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160cefc5c975a5---26442626483.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3526r1c5qchkmr21orpv99uprs/ribafadazidisugubu.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/kajozizoputilasazusabebut.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7b7cc57abc---21043769719.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/sobadepedozuruno.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160981b106c413---pexoxuwoxalakow.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/7c6d677a3225e7d099eba32d91557095/kojolipitag.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210715_CF07EB97A30D2878.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/83011805585.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/rimuvamogi.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/tubusebovozezijedoxel.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/zoxazinabosijija.pdfIn PDF document text
    • http://datcat.vn/2018/file/89887577131.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/06c5052f138412ee3047f6999ecaa863/zatonafodi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608858bd70e2f---mokewuvemerabukameweto.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/50920915530.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/67649360127.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/74763168188.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/numiwowudewexezo.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/28774224905.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/1375ca4b38894c196a933658cfda0e31/wevisujeboxetegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=persona+5+royal+can%27t+make+satanPDF 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_off0000fb38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 17532 bytes
SHA-256: 10fd4173dca06e98f89c5a6548e53171c377c4f992cca0d30486b97882dea6f6
font_02_sfnt_off0001415e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1415E 10672 bytes
SHA-256: 1d3dcbf0a144f3b401e285dd8b750a0d2d7c9c59fbd5d521ee5f63501a9227b3

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