Malicious PDF — malware analysis report

Static analysis result for SHA-256 c89cb028e4ea718d…

MALICIOUS

PDF

82.5 KB Created: 2021-08-06 19:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d3ffdc440224cd10029363396c2c0a88 SHA-1: 2e25a0c6d5bd2ce345d6e879b8f6a44fe51f7966 SHA-256: c89cb028e4ea718d7b8809074e8f9e7e5319642899ae8f53f5dfbe76deba9999
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/n2subt61k3traoeftf3q83vrmf/sitoxetugujekutosewe.pdf In PDF document text
    • http://aldobini.it/userfiles/files/41600502159.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d96e99d0a9---70754265740.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf5257e8dd---22702563900.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/xurewarobetavozixutofe.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/tolekuteratuwaxisobijo.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d73c9c2f56---3662132316.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/xaxesemanetu.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/vewoponin.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/fewexemaluwajejinesopaxe.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/57533429848.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021060121299_826325009.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/85925903099.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/31853541088.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/xejazunajenatife.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a906c8e5c---sokizolojalolopus.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/kexesamapixagimazuxe.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/18051021979.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/janezexaxolakufozusukat.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/welaxujaladapojulekakevam.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/kobevojafefesag.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0524f6c54228bfdfa063d67b3fc22f6d/21867662313.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/nivijijinudozoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=surface+area+prism+worksheet+answers+and+workPDF 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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 17176 bytes
SHA-256: bbb428edcb7b7778c0c3f7963a67514f318715551e99130b02357edb6213f0fe
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 11192 bytes
SHA-256: bafabf197ad09094c006945952ca8d13e677af7f382516528f9d42b524186152
font_02_sfnt_off0001223c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1223C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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