Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a78d512f7ef2dbc…

MALICIOUS

PDF

78.5 KB Created: 2021-09-16 20:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d22cbf98256f9e25f9968ca60b346660 SHA-1: 8c81a9a717f47923d01dbc75f3e95ca0ee58a03f SHA-256: 5a78d512f7ef2dbc715042d87c4778f56e8a64dba20ce247b415db670b0f4bd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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 https://drafthe.ru/uplcv?utm_term=small+prince+pdf PDF link annotation
    • http://cuacuongiare.vn/upload/files/zipekazojegipog.pdfIn PDF document text
    • https://g4m3s-4p1-12s1.com/contents/files/34134843253.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/51913673932.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/gisari.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/85068977500.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/37972979717.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/69596247130.pdfIn PDF document text
    • http://odontoflash.eu/userfiles/files/jirexuratise.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/15527995824.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/54097684311.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/12758001344.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/8d277b8f04eaeee4325a0ccc387e2b40/pobenop.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/27bkkbq8h8hdt751u1feslfr37/17357106449.pdfIn PDF document text
    • http://rainternacional.com/userfiles/file/22977056359.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/tajijozuwisi.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413b4fd1c6d---98177286233.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/12769948369.pdfIn PDF document text
    • https://ms02bet.com/contents/files/70198760394.pdfIn PDF document text
    • http://p-energo.ru/content/file/vitejilamorumifanow.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/20926057934.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210914185016.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/83596367563.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d5161921c2a45fc822bbd3bfa20c81fe/zutopofuxalukile.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/faxaloletoxagevi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB902 16152 bytes
SHA-256: 898795584f34c9eaa4f82220337173d17343e0c84bf0c6901b91b02c17a78642
font_01_sfnt_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 10472 bytes
SHA-256: 4976f5033b1933d9df3a22417ae1f7f76e1ee3b356bb9ad3751d283fe917819b
font_02_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 17728 bytes
SHA-256: c9d9078a0b4ba62c8bbc0ed20bf40f77beea3e9781cd32b7c1fe1ff355e0a7da

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