Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec978111f71577db…

MALICIOUS

PDF

68.3 KB Created: 2021-09-22 17:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 870bbeb3da0f6501809f6e075112f35d SHA-1: a33eaa86588fc0447b99e08803b56f1264878b29 SHA-256: ec978111f71577db4004a8b7f73d90a9621fd329e2af3ecc09b663be891a736d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6824

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=bollywood+hd+wallpapers+for+android+mobile PDF link annotation
    • http://ottotech.center/userfiles/file/xonavinefinarami.pdfIn PDF document text
    • http://zgic.ru/!upload/files/81560564547.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/89044128655.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/10321597663.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/godemil.pdfIn PDF document text
    • http://furniture83.com/upload/files/37729125476.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/zunofivisokorebal.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/lifinubewuninipi.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141757c7c575---bafizowakitobakode.pdfIn PDF document text
    • http://anitacalderon.com/ckfinder/userfiles/files/puvoxusa.pdfIn PDF document text
    • https://jurad.eu/files/file/59637124382.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/74021350597.pdfIn PDF document text
    • https://sy-chemical.com/UserFiles/file/31640183706.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/eb759b6b5d167bfaa4ec6f00b8916320/36940486233.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/xivox.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/lofufinuvenevog.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fupaxipomutixegajab.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/82983725193.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/nedirojawor.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/fc57c8a03ffd33849ed720b796126730/bosodegasov.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/vodebofefeganinajit.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/botukekelezifetudipik.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/47434179994.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/14923680811.pdfIn PDF document text
    • https://ms01bet.com/contents/files/kibemejavugufuwudipetula.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD349 17624 bytes
SHA-256: 4a6240be4ad2310b15ff76c0be9572c62f858b713e39ead1000dbd1f25545d4c

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