Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75819ad6a40e9f5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-01 14:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a4ec4cd44f1a1c6a0cb16e60a32383a SHA-1: dc840c7b8812cf44a8c96f84ca8c4d721fa2a235 SHA-256: f75819ad6a40e9f58c480e55b3a9a3c4b773aaa29b4ec70884ef49292283494c
124 Risk Score

Malware Insights

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

The PDF contains a significant number of links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3643

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://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096537dd4b89---85288138296.pdf In PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/sovasajisudalugazole.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/nosug.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/71820022240.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/d3ihu3mhhstkihvrk7s9bcro5u/molegaju.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087625247b9e---potizapinazasajiri.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/sf679789ujbfhlp56aio2en5i4/tumas.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5337c6bd8---sodifurajuxikimutalu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/76ab74e9d3e6c588d92bad2242c4a8f3/wowelubizupamimarud.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/8982679198.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/arvhtdjg85khahcfgjkne7rr06/95130814782.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9m0niknad4k5vkaj1nu98grs96/96575357733.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/65851cad39ff77ada86ba3c25486e2f0/lisit.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/65ee2f89929e2c042e90fe6cd576e37e/31059594824.pdfIn PDF document text
    • http://thsport.dk/userfiles/file/vamojabibonane.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/d8a19be07ec536b5efa2a468b9530fd3/78411854220.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/gemobukipupilixizevesaji.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/mifulefusokelepanawomid.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/nepora.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/63993241649.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d92c7cf11---4513009268.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/2cdb5f7319105cc8ef57a8bb2b9cf3b1/runaxozikimiwujavex.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/gexexowubixumodobufazem.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/42679d22aa52d13044f4663209ec7695/negusexitenitusal.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/seguxitidenopugopujosinab.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/70049682654.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53d3736aff---zirifomumok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=liabilities+meaning+in+accountingPDF 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_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 10672 bytes
SHA-256: be2ca0ed7fea55f9f25712c12c033075802e94269aacd3a098bc20e64770f1ce
font_01_sfnt_off00010dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1