Malicious PDF — malware analysis report

Static analysis result for SHA-256 454d753d7529ad3a…

MALICIOUS

PDF

72.4 KB Created: 2021-10-04 13:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94cf95a80f4943875dffe798fdb8aeb5 SHA-1: d2f78e21b359d59758b9a6e098017fd96bec8f6b SHA-256: 454d753d7529ad3a937fbb26deede73b7e48e07f43b8ae73bfd5bf583d39b38e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/didunogepoxuralemo.pdf In PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/95320298419.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/dilob.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/tubevew.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/vemisorawefejimikiz.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16156635958f4b---zazidava.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/51489278971.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109111648005794.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/kinumir.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/25289199517.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/28406492590.pdfIn PDF document text
    • http://weshare.vn/attachment/files/23653864512.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/56ttke796p8v5840ca4rdqu324/bubusor.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/pozomuxaseb.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/tojugo.pdfIn PDF document text
    • http://rs-entp.com/upload/file/92338875298.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/290de5124a8ea84b469d6515cdf4d57d/63814581398.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/xiwogivusuf.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/66579972538.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/60862384899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=electrotherapy+simplified+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_off0000b58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB58D 10880 bytes
SHA-256: 5207337c5ac1ded0e885d63cf5c89979deeddbf8bcc76473c7084f3321df1720
font_01_sfnt_off0000ceb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB5 17516 bytes
SHA-256: ab624fed6346353f299900175c1f15353d80e219a216f6575bf7d3f328f93121
font_02_sfnt_off0000fc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1