Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b14dee8d33f7d3…

MALICIOUS

PDF

82.5 KB Created: 2021-07-14 08:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4ac95972449cd049757f0218a9e5833c SHA-1: 11609d1c2e10b99fceb56e1c92cbd14eed1a9b8e SHA-256: 13b14dee8d33f7d31660805d12522d01d85f4dfeb7c55605bc4a7ce8f8789d57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these redirects. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=french+creek+state+park PDF link annotation
    • http://xedaptap.net/userfiles/file/sulakazofagovukoneka.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/xewelizopu.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096d2dcca8fb---5277720690.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/54238413311.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vst43bisvj4ccc2chgl3d9vsc3/lijutag.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/vesekubugepit.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/fapareketuneg.pdfIn PDF document text
    • http://groupkaishan.com/d/files/kakod.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/5f71a81425c410529ff5e1248a9c2723/seweginexonelipobugawunaw.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093d48f3c44c---zowuto.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a5c1eb85a---pasasaban.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff66b6a0be---tegetupaximik.pdfIn PDF document text
    • https://susta.vn/userfiles/file/tuxon.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071abda868fe---51506472397.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/wekubapokamigodobi.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608455efdd710---79943812898.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c365cdaae0b---jefutaz.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/gipefofemolibeketegaze.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/54357326677.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/edosf8ac9bhuh8epn3pv3bget6/34974177252.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/0e03b2601102dd585026f0940e0d8f2e/53404978366.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/5393783348.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c828419f81a3eb0ca830305df7fcc16f/52241501631.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c912bbde730---lepomadufibugeritubodu.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105131600.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_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 17080 bytes
SHA-256: 4db300898bd32cb6e05c9705181d0722c75e18039477eb27c37e1da66aae6947
font_02_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 10280 bytes
SHA-256: 9edef38ca7649c9b2edb4da75f4d9f51bec3cf87f72f315ebd995b91e1b61c65

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