Malicious PDF — malware analysis report

Static analysis result for SHA-256 8307909740e8b7da…

MALICIOUS

PDF

116.9 KB Created: 2021-09-07 04:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e4ac12a8b4a839bc42118325bff1336f SHA-1: b8e7a0481073a9795306b1f6126dbc5fd6cff5a1 SHA-256: 8307909740e8b7da7fbf24115fbb3d1b513788a210890dc4d616738f41036c3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9177

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.
  • 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
  • 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://noble-program.site/js/ckfinder/userfiles/files/37010587938.pdf In PDF document text
    • https://avigailpekelman.com/sites/default/files/file/jinerazunurokotenebe.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084886585576---nivuje.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/39c70564aaf13e24d04efd7d4ef32048/lukarokubobopixuzafej.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/26301035112.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/nazepanexu.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/75064920975.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/36170582492.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/62911041459.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/kiwizitolo.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/9219271246.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb844c3b31---9901376949.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/84569453917.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125249f05941---jizelu.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/tagisarevabuku.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/bqtmv0eqj1ub2oo0u3bjcnirc6/kezugesureruxigutomixuba.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa6aff798db---naluborodelotemesumerig.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/230626538325.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/14720326581.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/5830485120.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/47700310354.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b572a8fe8a---13159197458.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610abd1cc1ba1---xenufovuwupizutev.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/59671687335.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/7oaghkg6likom9431ul4u37dsu/38658006358.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4db5896fcc---sogepiramuwabojexagulivi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb42478f8b8---53904918697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=strasbourg+st+denis+roy+hargrove+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FC 24304 bytes
SHA-256: 50a46ff59deb631b92a579188629b40613f44ced969a467a02aceb8ee8f92577
font_01_sfnt_off0001744c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1744C 16164 bytes
SHA-256: a0f26d9ec2bc0bbc84dfb8c1a224a49f7f70479ac92e21d726acd811d43f3bd1
font_02_sfnt_off000189e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189E8 1908 bytes
SHA-256: e1b34b56f766b52dd7f6f1608e19e75f17ced996a683346d6fdfd66d0a8877c1
font_03_sfnt_off000192bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192BD 11228 bytes
SHA-256: ccfbd4e168a5f0866ce80abb031a133fe0ea7f9e690e8faf8f2306666d611127
font_04_sfnt_off0001ac9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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