Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1c6698a6ee5614…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 20:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29ab97928a34638fad80b50eb2bba973 SHA-1: d4211bb951aad4a12174f5bc4a2139791cf4b408 SHA-256: 5c1c6698a6ee561465e485e1444ec31fbcdcd8e2c2d719c081ccbb4be6460388
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7561

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zgic.ru/!upload/files/kalumik.pdf In PDF document text
    • https://yogaspotny.com/userfiles/file/21642860191.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319da3648f3---kivewabibuxadirogulos.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/selajogenumavavutoso.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pilive.pdfIn PDF document text
    • https://combrooncom.com/contents/files/kavixe.pdfIn PDF document text
    • http://vtaky.sk/media/file/50737836665.pdfIn PDF document text
    • http://jonme.net/ckupload/files/nukubogunobixanusezi.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/91482830592.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656874af18---97432603914.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/nemikotawawalazipug.pdfIn PDF document text
    • https://kiptep.ru/file/74957384356.pdfIn PDF document text
    • http://billsky.ee/files/file/ruberilakuzerusubunafan.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/muzurazanunomuluvogutova.pdfIn PDF document text
    • http://study4student.com/cache/fck_files/file/26524241792.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/87247768953.pdfIn PDF document text
    • http://asustainable.com/global/file/sitozaxutede.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/99490014977.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/78277241835.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/degexifovabelotejato.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/mokozobavaxatezatez.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5be831de1e9349068d736ab092b0c4b6/didosafolovadedakivegota.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/88426135983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=bulk+convert+mp4+to+mp3PDF 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_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 10672 bytes
SHA-256: 97e8311d3cde602f616afff513b9602eeab81462cc44bf51d61306aa39ff4b9d
font_01_sfnt_off0000fd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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