Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cb4a46b9b48426e…

MALICIOUS

PDF

77.7 KB Created: 2021-09-10 16:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d64e6d534553525bd2965f7d4ab027b SHA-1: 5a1ec7be066cfe0971b2e682bcef8ffdc553efb3 SHA-256: 6cb4a46b9b48426ec786bc98e307e8489c57a8c8e7ad17f9c7a2ec870c769373
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=tomb+raider+1+android+cheats PDF link annotation
    • https://mytopics.it/uploads/file/42769623881.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/perexerokozowebupo.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/dijezonozelupajiga.pdfIn PDF document text
    • http://adveotec.com/img/file/jumopilil.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392c8d6c554---negekudima.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/30833310341.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/46168736833.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/54697958684.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613230f458f5f---67401507891.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/161304dcbf0efc---punub.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10376055054.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/43208603162.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/xuxazizigirujozurifuw.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/mofadazofit.pdfIn PDF document text
    • https://huanghecables.com/d/files/tudajitasetotuvipumidava.pdfIn PDF document text
    • http://polkovnik.su/upload/file/34489716781.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/putavukawitimokile.pdfIn PDF document text
    • http://ifap.it/images/file/gusip.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/pofaz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2q7tgmqa41p908epr1baav7mqm/gogugepugezofuv.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/u5s03mhpgq5hgc85erso0qcdqj/7610345138.pdfIn PDF document text
    • http://immopolignano.lu/images/karajaxibubadikevanena.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/golatikuxitafunox.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/65315373570.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/mofejigubilixepujavekumur.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_off0000c9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D3 17320 bytes
SHA-256: e1fcd043e6bfd64467c984b02cdedad0c6ceb8891b261eaf81b2aa39c9fcbc24
font_02_sfnt_off00010ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE0 10744 bytes
SHA-256: 11f7d77154c214aa9e9589a7cb50d004af2be907216bf05b1e423170947f9824

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