Malicious PDF — malware analysis report

Static analysis result for SHA-256 f102e864ab350ef6…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 16:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 945964175a05750c444613f6e937516d SHA-1: 096cfb33195c3a446e76fabfd65c08c5f06a191f SHA-256: f102e864ab350ef68a2e63ff39abc2df3cd6fdca1f14960783cbb014a8752104
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://catamma.ru/uplcv?utm_term=hr+interviews+questions+and+answers+pdf PDF link annotation
    • https://areicon.com/images/file/karijilusiretewitoneno.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/a8fd88ee3266802b11f988324b5b2a44/reraranafemezezu.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/tazuzuvakezeniwexe.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/88343943898.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e06413e7e---67756691677.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0aa9a14d6---38240357031.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fa3eef75c---raxawevagasotarosujuravo.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c884805fb7f---94079100757.pdfIn PDF document text
    • http://starsunited.at/upload/files/80406420342.pdfIn PDF document text
    • http://dgjst.com/upfile/file/kojajezafasun.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b9fd65004---biwuge.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b2a0d155c---nukugatusome.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/livepiwu.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cfca6e7eb8ebded92499ea8c3f91e671/gimenubekedejirosolopiv.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723d63e0dc0---88973419088.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210706_16385626E4288A86.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/zamim.pdfIn PDF document text
    • http://cityhigh78.com/clients/2/2d/2ddbae4fb74c169819b3574d76e4e264/File/zefobulopalufis.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/21809089733.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/73352073066.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_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 10836 bytes
SHA-256: 9214550b2b9e9ad36f58ca7e97c3470e5c11979fc6985a9cb72b3b0c031c0f4d
font_01_sfnt_off000116ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116ED 17404 bytes
SHA-256: 8ab69cb50eab5b80ddc7319a7794eff4d29377b676c455c5ea997488b2a64815
font_02_sfnt_off0001440f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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