Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ec762284e2a791…

MALICIOUS

PDF

85.5 KB Created: 2021-09-11 13:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 984ffafb2940dce729d6f32ac756efb4 SHA-1: ad7ae842a50f87fec2c7d0cc8dae2dbc8e4332f9 SHA-256: 99ec762284e2a791fae11d9b3f7ed00f9f831da2927ac09519e4b9c6579a488b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on potentially disposable domains or compromised CMS uploads, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. 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 0.9961

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://ddservice-bmw.pl/userfiles/file/keramibe.pdf In PDF document text
    • http://www.deco-interieure.com/userfiles/file/gafuzakegi.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/runosilek.pdfIn PDF document text
    • http://chapelguild.com/images/usr/tokudamukatepesamizegifex.pdfIn PDF document text
    • http://apart1day.ru/file/bosevoxajozazuxofejimun.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332278bce0f---35118023413.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/witunirom.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/4221650912.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c1ffef378469b3152aaed73f7141fe04/33406730175.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/11081521997.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/gipobisisotuni.pdfIn PDF document text
    • http://techmechengineers.com/uploads/kolatiralutugezuridata.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/lezan.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/sixamunowinurimenogopow.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/35290053825.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/putovalonadeviso.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/0cefd55448b2d6c17bcd038fddcd56a6/dosoruw.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/m03md930grr845ninu9lm6e1p3/46148046780.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/16940162148.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/93484223653.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/74773044418.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/3066e0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gemsloot+promo+codesPDF 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_off0000e797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 10356 bytes
SHA-256: fe94f3c78b610a704372f6bd85c6edba80badd5baa44ce7a426b299ff704dca2
font_01_sfnt_off0000ff06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF06 18916 bytes
SHA-256: 81880141af4871af87b43df1df50f0c656e47d5bdab51781396a01aad4e07f9a
font_02_sfnt_off000130f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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