Malicious PDF — malware analysis report

Static analysis result for SHA-256 9153ad7d98b3ccbf…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 12:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f64f85e7c5386aa2a1ae443d509bc980 SHA-1: e59d722ca9f7148511614e44961155377c43575e SHA-256: 9153ad7d98b3ccbf83c1586eddd9fbadda3698a6a4f322bfae2d74d8b2063578
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS upload directories or disposable domains, indicating a link farm designed to lure users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nomylo.ru/uplcv?utm_term=slow+mo+app+for+android PDF link annotation
    • https://marcvandewiele.com/userfiles/file/vutotexefirobuji.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/48026332603.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/51805654006.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/kotabetuxibumugex.pdfIn PDF document text
    • http://www.reeder.ee/files/filemanager/sinudamajosirerobaxipazuw.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/wejugowo.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/bikod.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/18409509186.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/wipexipepusikipika.pdfIn PDF document text
    • http://zkpower.net/upload/files/sitiropibulidevajilopuf.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/16978901244.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/44461634301.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/9438763345.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614186a976769---vanebik.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zavulawunusu.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/zuxaruzix.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/3cef4640b406457ceb8b48ef8d5f9a85/zefapanebovuvusezegepet.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/59643994296.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/26252243358.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210925061621.pdfIn PDF document text
    • https://ijp2.com/contents/files/90842861741.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6a6d68a28b7897df14870c6e774eafd1/27113673477.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_off0000ad33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC545 16896 bytes
SHA-256: d2375436e68eb9a160ab2615a3f22f61375794af55e7ac23d17a1811a7f2bc89
font_02_sfnt_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 10424 bytes
SHA-256: bd50f853b0da34831068ea9fa7b61821d7f2aff62957626d6ebafc818decb375

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