Malicious PDF — malware analysis report

Static analysis result for SHA-256 78dcec375b5654f8…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 20:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f3e9bea2f064d026d6711502146e4fc SHA-1: d500a7f80515d2cfb8bec3b2f5481dd1fad379a3 SHA-256: 78dcec375b5654f83a68d7df7d1eb751d7b62458df7f35871b0e52ea1d8596e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://amandamaitland.com/images/file/zejiturabojuwit.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/4980f1aeccfd144db090f3a85b9bcc6f/57842920110.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/cbaae8bb9a16703197db89e80ac27a60/mutikedezip.pdfIn PDF document text
    • http://umhouses.com/uploads/files/48209614991.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/24243385617.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609758f4822b3---xesamizuzajatuzutubaker.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/jolabemobigorobeguv.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c19f2a3dea8---66895390519.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5965b989---99697649513.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f82424d2ce---kagumikemorazuvilureke.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210715201756.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/sujedorurodolejavexawab.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/jinulamariwagidajuvejuva.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7281a115---vonosebivitasuju.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/32544055582.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/gorexobusufo.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/morojefezure.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/b0c8b9bd2324d905369fbfa0fefc7f69/rirejamomuniwo.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/37324960106.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/87451745965.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/kotibanititowikilil.pdfIn PDF document text
    • http://thietbidienmpe.net/upload/files/31688083067.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1a2c766ec---zebipelikupatobev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=que+es+corriente+directa+pdfPDF 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_off0000c3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C9 10728 bytes
SHA-256: 3c5f740c314eccf18b44e072151c681ae158dc633f9fc15ad76144084a4e8f5f
font_01_sfnt_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 18020 bytes
SHA-256: 2f7342ed03192e22395d727406d716fc3c1f7c763e40b3fc8aaf13827cee2bb9
font_02_sfnt_off00010aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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