Malicious PDF — malware analysis report

Static analysis result for SHA-256 8083ac2eb2cf0756…

MALICIOUS

PDF

82.7 KB Created: 2021-09-10 11:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b33648ba27eb0e2fc0019d2e3a0f5482 SHA-1: c12ba97a102ab40d3b2f692d081fa59ae9e7f91d SHA-256: 8083ac2eb2cf075696a3ca0043dca7d4410f8925b1412767656ef8361d735d19
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/tedeludozex.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd2f182c69---jowezifasafogozux.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/nanegebalilipaga.pdfIn PDF document text
    • http://stagegator.scorchmark.com/stagegator/ckfinder/userfiles/files/40625279876.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/pabojezuwaborefonire.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae46743dcd---dunusas.pdfIn PDF document text
    • http://vhz.cz/user-files/84627203252.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210904_C662D2AB40FF9616.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/77292913890.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/solokejun.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/89601211831.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/lipedemenudofi.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/87008075108.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/xofen.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/zowonapepefodo.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/86803055219.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/34440804351.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/87859951103.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xoveboxuwowa.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/33385265992.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/kizulegevubunapaxudoxivux.pdfIn PDF document text
    • http://machulski.com/public/file/53889820137.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/da67eaa0ef2710fc85f9b7c3e5217365/13402842596.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/24776702041.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zulifemibisilotuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=pokemon+heartgold+action+replay+cheatsPDF 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_off0000dc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC26 11168 bytes
SHA-256: 0eb57eac90b547240adfa9cf1ae12ce11fe60ca90e739f8ecf218eb23581fe29
font_01_sfnt_off0000f5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E0 18052 bytes
SHA-256: aaef4dd26d7417dd763c3c42a7140b3aa713c91447e08f17b0cbe8cd5b63c39f
font_02_sfnt_off000124e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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