Malicious PDF — malware analysis report

Static analysis result for SHA-256 89bf2cd25b905854…

MALICIOUS

PDF

73.3 KB Created: 2021-07-25 01:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: df1f969c568006b863a432ddd17db225 SHA-1: 2789ccbbc63996177d42bb62201a7b383f41da44 SHA-256: 89bf2cd25b90585496f022ed95a915c6442366b0ece7b2e050b17b404df8bc3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting an intent to redirect users to malicious content or phishing pages. The PDF structure and the presence of multiple links on disposable hosting further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5474

Heuristics 5

  • 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
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/eb45ee921e867884452b6c200cc61bdd/81482296398.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/d6881ab34fcab9ab0f9708fe3f395622/41786478656.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/24407e22f823562c1f765b043631c95c/niwipomisadavuvatosifamez.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/gixap.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/22a61c2042c0c6301b296ce20bcdcc13/23068242097.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/5bvtcjgac20aaaisrgg4i018rp/66186040561.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/98200147412.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3fkqirpk6r3j5q3130613d1gn3/90970670399.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/vomumiwesunopaxo.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/5f61fc0356777193080ca06e3efbb38a/lirajomitodevuginekegukuz.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/eeb97dcbbcfb252a16b2e18ea4ea4296/nenetukuginufedilij.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/vazije.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/a143c8e8d052874c827feaf2710d76c5/69001325674.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607219dba58be---lizewebafurobiwok.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/sutige.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/32726891282.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7aface72---zebidemo.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/bawifefo.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/50743531013.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160915518e8508---lidudiwixifepuxiludu.pdfIn PDF document text
    • http://easternsheep.by/app/upload/file/42397822532.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/30146048562.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/55586147990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=flow+hospitality+training+answers+licensingPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 10832 bytes
SHA-256: bc2f581dc80335c99138fcb7ba81f203350310b2519d4a3333a72d47a05b3d3f
font_01_sfnt_off00010cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1