Malicious PDF — malware analysis report

Static analysis result for SHA-256 e509ad7a180119d1…

MALICIOUS

PDF

62.3 KB Created: 2021-09-01 18:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6f27a9942ea277ee1fb0ca6186a0f80b SHA-1: 3576ba9819fb43b147725f9a3a41282805d70a3a SHA-256: e509ad7a180119d1c11238b7b84b72a72ea9b5d4dd45f8cb36a0cdf2f7b9a13f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6052

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://www.maderas-navarro.com/ckfinder/userfiles/files/fasofepebedupij.pdf In PDF document text
    • http://alimentosldm.com/userfiles/file/kisobalowafanukavifif.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/95646285868.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820e9e4a8be---mizajanedukol.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b98c9a3e---suduritonelov.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/7842d346c30995c69730bc70b677c443/85290138502.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/bazanumetoxotixorij.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/67084423025.pdfIn PDF document text
    • http://yi-xiang-yuan.com/CKEdit/upload/files/tukexoref.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/9qcq8sc5a3tu2a7gu95hq64vq3/65753413349.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210727173602.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/15440048398.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/kodupad.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/79337479261.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/g58hrj22aiuags73174pn6j475/soselabupased.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/kakofob.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/72336678705.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/51614062857.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/lematijesimiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=acer+aspire+7738g+service+manualPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/wewanonuxefogisuna.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_off0000bdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCE 11076 bytes
SHA-256: 6eb72d77b06e85f4cd4a9194cf2814daf54cc309718225ccb62c60c79e60b0bb
font_01_sfnt_off0000d7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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