Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8162072c4e97e04…

MALICIOUS

PDF

91.5 KB Created: 2021-09-20 23:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 69357daf32a7300b3e915d200bdc30b8 SHA-1: b7dd11232b775526d57fadfc29ed2b5240158c67 SHA-256: b8162072c4e97e04ae1604c66b741177713de6bc790a25d2e932840bcc557297
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a signature indicating a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2625

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://machinex-machines.com/UserFiles/File/tejajumedibejolupen.pdf In PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/kinokuzigigogokabudotor.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/nekigopanuwidixenalupuru.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/pirebuturiw.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/55711457808.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/xogurotefamomemow.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/xabitetuzegos.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/14182667391.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/2669047734.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/zefenubobirej.pdfIn PDF document text
    • https://maturana.cl/upload/file/43885209684.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/fubomibudap.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/77133898452.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/85343188649.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4f33bf00487dfc8542e88c2cbf2761c9/mikunidumapakixajise.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/fiviganuzep.pdfIn PDF document text
    • http://yibetter.com/data/files/14749649598.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/witoborolu.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/79232130828.pdfIn PDF document text
    • https://ienter.bg/files/63625569743.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc899fbd7---24973685142.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/gofumiremojopukifusisuluw.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f915c17c7---94900993772.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/tokozuvonomomofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=dover+beach+formPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210915/16317137645708.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_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 10300 bytes
SHA-256: 0c31859d201aaf280852000c3ed3e23e2847149131568ad977e60192dfdba9a9
font_01_sfnt_off00012a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 18964 bytes
SHA-256: 051c631695fc7693e88bcc0727ec4bef4c9df58ff22f8e65e47ae16ecd6e7797

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