Malicious PDF — malware analysis report

Static analysis result for SHA-256 29596347347edaa5…

MALICIOUS

PDF

94.4 KB Created: 2021-10-05 22:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: a85572b1f6589b96b5e7f000f95ad296 SHA-1: fc1d2b9c2d726c43271182b3f93a9861cf9a87ec SHA-256: 29596347347edaa5fefff98440eccf0f0753e97657340851006274426520cc3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded URLs likely serve as lures for phishing or to download further malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://chcial.ru/uplcv?utm_term=counselling+practicum+report+sample PDF link annotation
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/ramuw.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/rugeroketekexikele.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/7ea5ec887cf4a794a0f38c96beee4f15/sizutivi.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-8/20210908101021763064.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/jabaliluxikigapaveze.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/wimemasasimokoma.pdfIn PDF document text
    • https://rezilta.com/psum/admin/userfiles/file/13079749662.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/movagidapebitiro.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/64953733702.pdfIn PDF document text
    • http://usagimatur.com/files/others/lijidolugazatetozaba.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kakagejigokusidekofat.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615422236fac2---90456856346.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/28061186626.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/kimamipobetu.pdfIn PDF document text
    • http://only-svet.ru/upload/files/xiwomapijezaxazusikujafa.pdfIn PDF document text
    • https://aksusu.com/upload/files/78038651809.pdfIn PDF document text
    • http://hkacca.com/userfiles/lemutiloforedubowuna.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/1b25a3ca20064977f7cc8c3145c18d07/13982723223.pdfIn PDF document text
    • http://lgassociates.in/uploads/buwaloz.pdfIn PDF document text
    • https://eguiders.com/uploads/wajezipokodatar.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/36695941702.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/33707711374.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/27187845611.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/4842626654.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/6912903204.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/30672449536.pdfIn PDF document text
    • 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_off00010606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10606 19872 bytes
SHA-256: 355c5e15a89dc6ad14ac128cab5c0dcc174236d05f5796c37b0dbbf23be4e0a1
font_01_sfnt_off00013a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15276 10848 bytes
SHA-256: f6973d053c3a84cf4b73a6c485e0ab3b08bc5b9e64303ba23277ca42cdacd1e8

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