Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce248e17a7762c4…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 14:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32dd028e039d68c0b84ab88d2e2154d6 SHA-1: 4e91407feb19e6f6e71f46729084e7a5baf38f2e SHA-256: 1ce248e17a7762c40bdd417a1c633b93f0463d82ea8b1e435589f1811a09d126
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://druckmaschinenservice.com/uploads/fce/files/semixizudulep.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ede56793c---59257733325.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/733567900.pdfIn PDF document text
    • https://durimawar.com/contents/files/jopavatel.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/26456256708.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af84a3bf93---3970694893.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/febudosiridikugerunixem.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/wawedibanumiwudowuduxe.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/gikiser.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/riwoxelixusagodabovu.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5bddc24e65d4ace0545c239038291fc8/92871129410.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/jtdb2n0pgl09qkme1ogg4pqd5j/3465145439.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a78429e75---kexukunenuwojur.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/99620423708.pdfIn PDF document text
    • https://h016s5or78-du3.com/contents/files/73511371903.pdfIn PDF document text
    • https://akemi.ro/hirek/file/vimijevexanija.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16141912ad9719---zowomeja.pdfIn PDF document text
    • http://alpes-maritimes.proximeo.com/ckfinder/userfiles/files/89208309250.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/b157f9088a184e608b27aabc2ab77458/20257732874.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/90397038907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ms+excel+in+androidPDF 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_off0000b180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB180 10360 bytes
SHA-256: 1da89ebd457fa04d4b2e4086228ada1f57f6460cc7b2b1fd37020c833d48482c
font_01_sfnt_off0000c8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8FE 17220 bytes
SHA-256: 107c9753a21b2d143c91167eea923e6fd1b6c1ae90ed7f8fd86548c7011f0935
font_02_sfnt_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1