Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c7140b5777b47a…

MALICIOUS

PDF

95.8 KB Created: 2021-09-01 06:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17bdc29167c3a6a9a53bed861b12a0ab SHA-1: 97005f3b5d8976e792acf5d2006d871c056bfd87 SHA-256: 38c7140b5777b47a358a99894df6a608e4afeb98c13a1652f8aa3379889366e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=279+dollars+in+rupees PDF link annotation
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/2tvp0b6u2d3v6irpubfe7dopcj/xerexogivabejelo.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/pedumurozan.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/xisenodojatipiganujipek.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/8e8b50d20d3f4dcb965498de757e39e6/keladesuzorukibasusired.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/96903879319.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/gerolel.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba73aa5017---xenozo.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/53468343793.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161219620968fb---6107600484.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/vunemiderofen.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/29435930937.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/7jheu70kguhqqfbigebathl4nm/tamima.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e69401158---4673353782.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/sidijejiga.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f85ea9c51---37714741756.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/jumorumilupusel.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d353488b9---34749358766.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/paborefe.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cdccb5e31---pibuzoxuwovetifexoli.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9f8775ddbf17aec64ad76ece5754eb47/32450175492.pdfIn PDF document text
    • http://evola.it/userfiles/files/68731142352.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/zobin.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/219573374528eca7ae0da7b7d94d72ac/5907415154.pdfIn PDF document text
    • https://plasy.com/uploads/file/78051095729.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/85638243875.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/zurawoxetobixijejujek.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_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FD 10628 bytes
SHA-256: 0338789b5635f99368d2e8c04bb8d918417538671c203858a3fa66a00a566bbc
font_02_sfnt_off0001426d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426D 18024 bytes
SHA-256: 30bfdfaa41bec7a4a37c3b40c2f3fcc90fd6ca9cffa3818ce30bb06c0c92b7ff

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