Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc46b41dfe5d522b…

MALICIOUS

PDF

91.8 KB Created: 2021-07-25 05:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2f5f469e444f873ff3d8028cc63176cb SHA-1: 518e5008890658d3f3cb4416744d382f9000c287 SHA-256: dc46b41dfe5d522b46f51d0de169880fb1d7115d787aaef0c009098d68db88df
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest the primary goal is to redirect users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://next-engineering.com/userfiles/files/5724051490.pdf In PDF document text
    • https://resonanceacteurs.nl/userfiles/file/tamukelokolumewibu.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fifozo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160be44f37abd6---11287953906.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/48047246595.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4beb04aa51---wafinuroleguvi.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faf533e43ef---51993873797.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/58618549636.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/xuzudepojikuritalu.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac23033528f---59179379944.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/66470229661.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/sujogukexikegirum.pdfIn PDF document text
    • http://hodori247.com/uploads/files/nuxoliva.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7acee91a6c---takipodomipukulap.pdfIn PDF document text
    • https://areicon.com/images/file/zabaxijajozepolipopebasa.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/gidapoga.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/nezedufewazigolitizupajox.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/44010472335.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/38975287841.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/25404572616.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f305b246ae---texetisu.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/wulelos.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92cc304f4b---tenotepitudegapejamumere.pdfIn PDF document text
    • http://planbmedia.hufiles/jeguzafobumotej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+cook+a+pork+loin+in+a+pressure+cooker+xlPDF link annotation
    • 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_off000104a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A7 16892 bytes
SHA-256: 7cdb67baf74659f2b50001f563df178dfe3ea456efdfd847b605c53e4597b7b4
font_01_sfnt_off00012fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 10740 bytes
SHA-256: 18087749927d06b8c811662ebe9eeeb373d262a2daa791d293e9067ff8d1fa4c
font_02_sfnt_off000148bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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