Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccf2949e4229e93…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 14:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 325b470339d843a5cc147af670f7f114 SHA-1: 1c8a6806b483abefc67a700a81666e445c0c0926 SHA-256: bccf2949e4229e939a9c0f4a44d7dea2d6378e13800e876136f34d71ebfadded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=android+convert+jpg+to+png PDF link annotation
    • https://coherence.cz/userfiles/file/dujegowazusefosugevo.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/nuruvebof.pdfIn PDF document text
    • http://tieuhocsondong.hoaiduc.edu.vn/ckfinder/userfiles/files/17522028109.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/4iuo5eephhanj50013flaqmpj1/pokinububoxuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372cce8e914---xusasaguvo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/rnotrctqhle145mu4auj97hoa3/15192234026.pdfIn PDF document text
    • https://andhimazhai.com/images/files/78612580089.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/votiziwuvejij.pdfIn PDF document text
    • https://terracell.pt/images/file/63356608307.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/81948146447.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/mokup.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/20af668dc17cd04ea365088714ffb679/xogikajimakefiteki.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/3i576o1igpusjljkrjqj2v0l04/25980826070.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/13597324827.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/47312354216.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/24594958651.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/4726989732.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-14/20210914094440761164.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/mugutelajusodegovazudob.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6141a4efa---tufukorepipofuvuk.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/34012575023.pdfIn PDF document text
    • http://desiaussies.com/ckeditor/uploads/files/busus.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/97511042540.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b0f69db69---71732737694.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/13326065832.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_off0000c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C0 16556 bytes
SHA-256: f936b3fa0e80cd56985f5a9a80d04794589f0b29aa7f44365e2df8c8ff727857
font_01_sfnt_off0000ee74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE74 10488 bytes
SHA-256: 213e53c17f21c55a82894dfd6a47bdf771a042e59219407027f7ccb770fc7bc2
font_02_sfnt_off0001062b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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