Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78cea268b475bdb…

MALICIOUS

PDF

79.9 KB Created: 2021-10-09 04:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9d42586d1179edee260c9e7ad14ec65c SHA-1: 03377ad4c98ea608d4d81dab08aa21942d24d57a SHA-256: c78cea268b475bdbe8ea0d8200d30cbda1656e4a07e4ea778d51d134ad54b28b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards a common pattern of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=sample+business+letters+pdf PDF link annotation
    • http://polletnv.be/uploads/files/71009806070.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/nlt05lj70rckbllgef2956lm72/bevodipafuta.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614d36546ff9c---91799638914.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/noxelute.pdfIn PDF document text
    • http://word.mn/uploads/assets/70078033154.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/28062218601.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/mekaf.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/rivaxepevakufep.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/os3okhjhp7mmibjccb5h66n5rr/kokuwusazosozudoxud.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/58486242069.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/nerefisejawisibi.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/katuxilejenabatedowuwa.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/dalesimafirikelix.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/vonenozuzapenefuba.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/fowawuwiturazulakufozoze.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/jakenisisegariwewigodamig.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/dowanarufegelalazofemasid.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/pemexebarukojuposapoj.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/14215731961.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/23708888767.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/tidozametekimotesogopim.pdfIn PDF document text
    • http://storemisr.com/uploads/files/68656883754.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/nedokerurepaje.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_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 10852 bytes
SHA-256: 1be12d89dc0a375b86202892aaceed7dd1b241782d55436181699ff0f1960c36
font_01_sfnt_off0000ee3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10651 17152 bytes
SHA-256: 4fd17b643028e81882550f2b2e88367fa5f6ce838228c500c4ea223f468f6367