Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ac2f02e7bbb4e1…

MALICIOUS

PDF

70.1 KB Created: 2021-09-05 20:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1b3fa8f21730db971bb4071b0c01972 SHA-1: e0a74c479da79262b09368961c50f4195ad6a8bb SHA-256: 78ac2f02e7bbb4e10e80cc91f8f9b4760658380755403fc55280f4eb30d0c1cb
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 pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of multiple unknown URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://ozdoby-betonowe21.pl/Upload/file/62124709947.pdf In PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5989c2636---voxezeduweliv.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/tegukubapu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/7nb0du4kftlindk67ohe16h8ms/94321264219.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/58f6ba3c19bda107d9d92fdcfd408e1c/lawupewuvedegaxiwitepo.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac612c87327---46291115014.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6996245fbe---35058034199.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8b8b3a1c1---doleti.pdfIn PDF document text
    • https://daismene.it/file/45630026143.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/jafomufesuzubirimabe.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/sokubufejobe.pdfIn PDF document text
    • https://sanmall.ru/files/uploads/files/23287404521.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/39983125233.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe5e839ad5---fifutasemiwuxadipekutusu.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///77792025252.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d540ae3d74---zavubusokelejepup.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/6aahbu73mpph19f7o6kbejbmr5/sobinenudukikabaj.pdfIn PDF document text
    • http://shosholoza.de/file/bafiwil.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/65218338494.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/91466298276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=clair+de+lune+piano+pdf+freePDF 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_off0000b20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20E 10356 bytes
SHA-256: d42612cbb1012307d2e40e9c766b5a1063cb9580f8c7d3e720003e85ee3f7d3b
font_01_sfnt_off0000c971.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC971 16892 bytes
SHA-256: 747c71be159dbeb6a3f69e36b7c7f4e2507dab880a4033cd19862958071e876d
font_02_sfnt_off0000f35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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