Malicious PDF — malware analysis report

Static analysis result for SHA-256 831891ebfe3e3ac8…

MALICIOUS

PDF

99.7 KB Created: 2021-08-07 19:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72ab6297d30d7ddd08f32c8920e26b12 SHA-1: ac01804bf5bdb948b0ec9ffcf0b393865ce44384 SHA-256: 831891ebfe3e3ac8c5b960e3d6d0148b894b248809a5f29b0f3df361110a0ceb
164 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 high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised or disposable hosting sites, likely to distribute further malicious content. The 'SE_INVOICE_LURE' heuristic indicates the document's content is designed to trick users into downloading the malicious PDF by posing as an invoice or payment request.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://skiflogistics.ru/userfiles/file/gojij.pdf In PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/wekegi.pdfIn PDF document text
    • https://linker.tw/files/dofesenamijaz.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/63180957962.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/50816597466.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d01792a83e---jajokix.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b18cd3cc08e---73977023828.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/jigokagedof.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/20699628856.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ae8575217---dimepose.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/pefegew.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db92e5b450---kumogugadib.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/271656392864.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca24d7966---fobopoxilodasagumefurete.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/rokusefajifebeganu.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/zogukoxopew.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/xenurazanuk.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/ff46f1f98e9f1f8d1f7d866e7e302b10/43219748881.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/2663398566.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/monevoboxin.pdfIn PDF document text
    • http://bscartridge.com/pic/4560608639.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/99664175120.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/vusozuku.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc4dfe135a---zegatejunuxozapudebuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=what+are+signs+of+witchcraft+in+the+cruciblePDF 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_off0001239a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1239A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAC 16628 bytes
SHA-256: e642357eff3263dac77a0e2d141f156dd0e83697f78a602c1e54c7ba64c4642c
font_02_sfnt_off000166d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D6 10932 bytes
SHA-256: bd1fc4f175e05618805c57fbd85cd4839d0f1427561e34a1e3a042088aeb358b

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