Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc51f83381e05ab…

MALICIOUS

PDF

78.1 KB Created: 2021-09-05 21:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9bc81b8a63e8a9f56685117af7420aac SHA-1: c3eb89ce931e7fd42420ac387b9d27a9bbb24408 SHA-256: ebc51f83381e05abee2e5d39685648861bb2004de729f0aeed1f4cf125b2aa25
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. Heuristics indicate this is a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

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://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0411110d7---50960945653.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098535ce56f9---74818547599.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/0id45s08d2d0ge6l99at19qd67/2260795246.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/27834625877.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/m8teq85tuka0hhkrn7q3gk1a0g/16087738688.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c628a18ab2b---lovurexoxamuzow.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/funidusuripuririzuvuvaw.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/afa20f146978fac870898d2436f71292/xebobusoloxa.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/92737079122.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f712a5c50fc---nonuwuzaminijevakipakuvu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a9c748cd3---36974997316.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a87a5c11---vuzoxabupufomugepeku.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c664ef2a99---poxaxikodibipabuwafemav.pdfIn PDF document text
    • http://andrewclaymonfishing.com/clients/a/a7/a7b0d980ee28df7184f998a87a00dbd5/File/pajuxuvar.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/76686467998.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210731045542.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/34189712493.pdfIn PDF document text
    • http://talleresjpg.es/img/file/lamimitixifibaza.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/jne6c9al313lp1aqmuhq50u0n9/jikujewanibosiride.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/metovexog.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/vopegipu.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/0nnjoq5j07o2v2sek3kipqd8iq/gegebezome.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/16723868377.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/durobitu.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/suridiluxutapaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=como+cortar+un+pdf+en+dosPDF 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_off0000f03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 10776 bytes
SHA-256: 57e7d700adc9d6ae7ec3d3a9adf543d7a040cfa186d0b7104fffda958f4d76b5