Malicious PDF — malware analysis report

Static analysis result for SHA-256 c273f25bf013fed9…

MALICIOUS

PDF

80.7 KB Created: 2021-07-31 15:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3ed87e2c03b7aa91ff12837bf49f92a8 SHA-1: d31c9569b6d025795b11609e35418294c2b59f0d SHA-256: c273f25bf013fed939a1f84d7948fd5cb07a5d41fd54ba5345b3d3b1f42c962a
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8667

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 http://tunglamgarden.com/images/fck/file/wijorojoderuzoramasa.pdf In PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860497337f7---10257308508.pdfIn PDF document text
    • http://strandedtattoo.net/file/tazijumipipuna.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4da2e099916a85d43cf304750d253912/xonafodunuwumebu.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sakepasenijenogikigaxe.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/wobulab.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b47c9bad927---86818745552.pdfIn PDF document text
    • http://fittbikese.hu/files/file/sogikubanenunesarilu.pdfIn PDF document text
    • http://simonide.org/userfiles/file/70424480977.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/c64d7fe8d4f0dbe6370355c6674706ae/97759478673.pdfIn PDF document text
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/xizesori.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/47cb2cd9386204928131421795286713/332699527.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/nilirelajilebaxilunek.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/sipamuteso.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/ef1da9a88a19122e476740e61c4a0674/20393190381.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160eca95034d67---sesasepatabinakifigig.pdfIn PDF document text
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/xukipewedufod.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a7df01f6a---33681336586.pdfIn PDF document text
    • https://majubesar.info/contents//files/70703250866.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/14973166641.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/93077801175.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/27be716c2db0e89f59ad07a890d20066/73285164239.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xodatamewegedopenakilalu.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/90637342892.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a3c9de94c---dodaxazexoboxurakasalemun.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/xerevomexevuganuvebamupur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=games+to+play+if+you+like+nancy+drewPDF 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_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 17684 bytes
SHA-256: a459eedd0ee286901576c15a92608a27ae110c052c9949001af84d532a992bb2
font_01_sfnt_off00012c6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6F 11212 bytes
SHA-256: 30e5bf7526962d8034e1fec6c7fa8cbc8440e7e5507cd8a1fcfa5689d55d6ed0