Malicious PDF — malware analysis report

Static analysis result for SHA-256 5339838fadd9a4ef…

MALICIOUS

PDF

78.0 KB Created: 2021-09-08 09:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 23e3b3411d6a84145791c85b182de425 SHA-1: e8163d37677d807cdadb51741e7efd4bd2113c59 SHA-256: 5339838fadd9a4ef0a15ed28290149a86278edfe0ab38010995f05d3d43d2d10
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ClamAV detection and heuristic firings indicate this PDF is designed as a link farm, likely to lure users to phishing sites or download further malicious content. The presence of 'utm_term' parameters suggests an attempt at SEO manipulation to increase visibility.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3524

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://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b04266ccea---kesuxoverurijosota.pdf In PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/wibofeledajorizumu.pdfIn PDF document text
    • http://lscapital.it/images/file/zugifu.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/wasudirajopef.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114a7f997f79---bojidobunepojanogaji.pdfIn PDF document text
    • https://lemanssrl.it/file/bisuxewinaxowefajopag.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/75883412288.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/074feafc88376084db3640defea0a19e/36126804240.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0681e7a219---mawititunojupuviralategob.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c0a73484893653c4f571c8deeb6bb2cf/82509170255.pdfIn PDF document text
    • http://limoride.net/gallery/file/jogudukaluwivifuw.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133f7777ff6c---bunekudeg.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/27665518776.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/ed095d3c0d0dffce2fea147d4ba8de21/67478086067.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/qlars75enfrtip0l4q3vovaokg/sipinot.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/duduvi.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa576be5eb---21461217177.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/lipabimapumon.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/mezalikitisowigojotop.pdfIn PDF document text
    • http://kelvista.lt/images/files/fisijalipilizufopud.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xedunuvinenafexujomu.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/90407078092.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16118a953073ee---97009406931.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d05476505---40419397606.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091187449a0a---fetitozogagetub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=self+care+worksheets+for+youthPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/kapeluxubuzuzezokifepegir.pdfIn PDF document text
    • 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_off0000e65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 10704 bytes
SHA-256: fa8a11df955b96c2ab3fd0edd52b7faa4d4f0f4602cedcb39b2b1c50b26df2a6
font_01_sfnt_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 19016 bytes
SHA-256: 95e05b0081abc9771ed30f0db5b72ac94d6889f1c2cf6aea771a7dff0a8fa1ab