Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb8ff4f6f30128c…

MALICIOUS

PDF

83.8 KB Created: 2021-08-19 10:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0600dbc8b0c60ffeac6e31d8a40289ee SHA-1: d8bbb91e61f47d7430c6880ca68b8e78e736e310 SHA-256: 4eb8ff4f6f30128c7814e2ccec73b1afb75b33d12b51f66a97dcd2c7d98f0fe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://teechart.com/uploads/images/files/18543110640.pdf In PDF document text
    • https://prestinireedcorp.com/userfiles/files/pediwobibonusepawosawimoz.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b1a76d690---53708681812.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/pirepox.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1543b9b6e87e790a9396d3aeb5186328/tujowodepusosaga.pdfIn PDF document text
    • https://projetovm.com/uploads/files/bugizirigu.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/vagedojosolasosasovaret.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/10045805999.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a6b13586---jabalujunemobixanidudi.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/putuluregezebunixumetan.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00cbd448f7---vuvunogagax.pdfIn PDF document text
    • http://momsystem.ru/public/file/webadowop.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a1923549e378a5ef942e1fb914b95405/senukexasupopamu.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210519122923_jjgsbm.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709bfb3888d---86673569797.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/ropimuvasav.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8f8e5f0b2---dibonabavazexajatijagopul.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/winemuf.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0feed3f0d3---wuvuxik.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/a83cb18a5c85dde903866c84e2949b0f/modibegozefevesubozexu.pdfIn PDF document text
    • http://nuestrasenoranm.org/clients/8/88/88a18899c67a61641ca1f7d027daa919/File/4633876428.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/39bf5be26c211d05cf8c8e106b1747de/40996725840.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8fc53f41---57899273859.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/lutotevasijokezax.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/dosedapomopoliwibow.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/42491485955.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=discovering+the+universe+10th+edition+pdf+free+downloadPDF 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_off0000e43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43C 16172 bytes
SHA-256: e4b812adf406ad5aaeab208b12ecf77829e4f7b2a7a28ecc88a0442b34b8b6e2
font_01_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 11324 bytes
SHA-256: 9aead44b5e36813e0537e546b345a6d75b18378aa78b3c6853dd60803e46d9c8
font_02_sfnt_off000128ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1