Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e04909aab6f63d6…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 04:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24738145a1b09c442478900b4b4cb28c SHA-1: 739989ed2cc62831a056d5b40718ed9c7cc65ffc SHA-256: 9e04909aab6f63d6b27939abf9decb6cfd01b584db6317d7be04b8300256d881
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The presence of multiple external URIs, many hosted on compromised CMS uploads, and the ML classifier's high confidence score indicate a malicious intent. The document's structure suggests it's part of a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://queure.ru/uplcv?utm_term=new+junior+english+revised+answers+pdf PDF link annotation
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d91d16d45d---peduzidekogakotulexo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ac070d3d8---24989758778.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fbd3c136925---38745792447.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/pizonuberikelokuborudura.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/dr63o943h2doavbi4iv2mqrup0/jazowiwaperugu.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/wutufowezedij.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/35a4313b83b8ad3da7d51d5187690a71/42420847053.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/11446105284.pdfIn PDF document text
    • https://geniodelweb.com/file/62778075204.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cade24a28f---baritezepeluxafi.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/zofebewidonot.pdfIn PDF document text
    • http://rld-carbon.ru/file/wuwonerarive.pdfIn PDF document text
    • http://u-spot.biz/js/ckfinder/userfiles/files/34955261732.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/fefetosalewubisupe.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/lovenamida.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/26985856882.pdfIn PDF document text
    • https://vpmemorial.net/images/file/61278957501.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/koger.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c13db9fc4---wamoju.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/guxakuwojiwuvepolu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6919baa8d---gorava.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9be90087c0f55fba30126e3e6428dd65/87984733069.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/86280727485.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/negefapikimip.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a8ff788c8---bawabave.pdfIn PDF document text
    • 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_off0000b9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9ED 11040 bytes
SHA-256: 6b8cc471807a049fd40e21870fb5310d861a7437f2d4c93330096a754414ee6a
font_01_sfnt_off0000d358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD358 16576 bytes
SHA-256: 281445658a9016e8df16bc889893b246e2b5a7eb40fb4d6b812043e62d5a3b3a
font_02_sfnt_off0000fdaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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