Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9fcf8677d531b1…

MALICIOUS

PDF

81.8 KB Created: 2021-09-09 11:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7cd7937770976c612fd62b197e5206ca SHA-1: d5245ed170b71d9575803ff8a498e4faf79bbce0 SHA-256: be9fcf8677d531b1abffcf78039a79c63d5375abbf36a1f7fa0bfbe41b4229e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://shqinze.net/admin/upimg/file///12005212558.pdf In PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/fomajojetegodenamumawiti.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/73549648287.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/70818971019.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/99069638485.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/897a6d9bcadca1bf76b62d5daa75f130/xazupozerufajifadoj.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/pitajom.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1631010224.pdfIn PDF document text
    • http://samtekelektrik.com/files/84863608931.pdfIn PDF document text
    • http://nenorm.com/files/files/sazek.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/lilenasopapazotiluk.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/12109030511.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/88240596242.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/39489395135.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13206533102.pdfIn PDF document text
    • http://ruizhishengwu.com/uploadfiles/file/032306157626.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/4e9ba9e1a063568b2c0dbb64feeebddf/dexelizedilunubez.pdfIn PDF document text
    • http://superbarter.sk/media/file/22866129655.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/80941697095.pdfIn PDF document text
    • http://net-marketing.hu/images/files/44411149302.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/58257148337.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364c5aa1e79---xopofekimege.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161315f687aaad---89486705352.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/mezijus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=rate+of+change+of+displacementPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD809 18636 bytes
SHA-256: b921a98fb779e1fab9588548d68d4a515ac8ed74f8aa88e544a2fd1d1d7f93c8
font_01_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 11012 bytes
SHA-256: b8ed69a4435f1c09674e009c0169073eecbc58911c50250a5667654ee0ebbdb1
font_02_sfnt_off000121e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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