Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4652315fe9b2f82…

MALICIOUS

PDF

88.7 KB Created: 2021-09-04 00:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e18fa2902cfdcbf889f522199ece2a55 SHA-1: 387a829a5be5775bd6d481cf59ad035bc321158e SHA-256: a4652315fe9b2f82a9424d2fb5891d07ad7ac60728c20eaa4eeaf98d539006be
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it contains a link farm pointing to multiple compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The presence of numerous distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier clean score 0.1831

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://retake.dk/ckfinder/userfiles/files/jolokutale.pdf In PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160862617cd617---58120046120.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/a4v2s1kn4m4qfhoeqa0i1iuma2/belagurotizusopuderopipub.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jk0dn3fbgseii55hg5j48q9a9l/rilovigukurupuwadurajef.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/talikorukixanolabaki.pdfIn PDF document text
    • http://rafaelokazakov.com/file/84661180686.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/57426226440.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f4d3cabe65---57384335010.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/46891334296.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/rexuroxozepi.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/wurukotidatojog.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59355103776.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/buduf.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5e80aebcd---90910623082.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11fda6654---womevaxuvaradajunipewe.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/47031033386.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767cca379ae---gijobujaji.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/78746176308.pdfIn PDF document text
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/55394511615.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da61f65051---tutewatulajafozosavof.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/45d86e64a7a9f1a4cb24b43f347191cb/95330214064.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/lizejabo.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160856f7c9aae3---55880048075.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/bixorakurek.pdfIn PDF document text
    • https://podimercrm.com/img/files/gezosebaxov.pdfIn PDF document text
    • http://manajrgvaaradhi.com/cms-uploads/files/76828699772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=rutina+de+ejercicios+para+abdominales+pdfPDF link annotation
    • 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_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 11196 bytes
SHA-256: bd705b6616a8dd9f7239b8ec1899740872d83098841b9f9624697d288c2b46ac
font_02_sfnt_off00013605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13605 19348 bytes
SHA-256: 89165043bbee0f5ca0f6d4556053851b01a50c8d61877a7744ff1754f33d937a