Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca986331837a5f4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-15 12:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9bc8bda9b816d7cc00657ed871117ef4 SHA-1: 9c91ab1dd2b48824a6dc703e9182e67badd8d469 SHA-256: bca986331837a5f4b29bd6224c874f29d6544998cb36374a1dd4e29fa4268d39
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and URL patterns align with common tactics for luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=mouse+conversion+pro+apk+download+gratis PDF link annotation
    • http://zwickerfoto.hu/_user/file/73576920089.pdfIn PDF document text
    • http://autovoda.ru/upload/files/wadexukorokenoz.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139abbe50966---86069307359.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/46354981165.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nedage.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/7372451266.pdfIn PDF document text
    • http://chikatere.com/Upload/files/tadodew.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/24021526797.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/66557599411.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/28477786198.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/gopipat.pdfIn PDF document text
    • http://mfcpavpos.ru/file/pitexaxabakevisapuzeje.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/55374953809.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/wizuwaxudemo.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/75813960727.pdfIn PDF document text
    • https://yasacompany.com/upload/files/nixagogonore.pdfIn PDF document text
    • http://congluc.com/upload/files/nonorebiga.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/51394419972.pdfIn PDF document text
    • http://calisnt.com/uploads/files/67084815509.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16140849f7f4b8---70066995755.pdfIn PDF document text
    • http://sksound.com/userfiles/file/fadodowigidojajowimupid.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/xevedunevepekefabed.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613433ac29cca---donobogasawabovenek.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_off0000ce2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2A 18068 bytes
SHA-256: 79e64bf4b7e55de735b2659d18a8f7274c89e0d0d512ee4ff98cb2c29fd5bda0
font_01_sfnt_off0000fd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001153d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153D 11028 bytes
SHA-256: 4fdd9e02f7e78a11f8ee306c924cf343bfef28ddd5ef9c91c74704dbd0fe5aa4