Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df242c364c98213…

MALICIOUS

PDF

107.2 KB Created: 2021-09-02 12:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 37b3f05ad73e8d3c22e6001204d6d83f SHA-1: a86cb57920ee85da93128f302e656f3d1dc3c989 SHA-256: 0df242c364c98213e915fe2ed325bd78246a572db9f1a4ab3e695e9a69d38e65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, increasing the likelihood of a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/buzivukawuzivogifupukiga.pdf In PDF document text
    • http://geostudio.eu/userfiles/files/39072496559.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/c608d2064c9f67ff048d453cb61eae82/91440550583.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/gorodexumudew.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/3405750375.pdfIn PDF document text
    • http://poorclarescork.ie/images/gogegog.pdfIn PDF document text
    • http://186086.com/upload/files/mizivoluwokezexigab.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/87367436139.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ufcj46lkcpvdd692cgn2kpmgs4/bopewegakajawe.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbdcb1d623---53338618192.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/69245345307.pdfIn PDF document text
    • http://halaljones.com/uploads/files/tiratelosinafobuf.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/13372174109.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/cf23ebe7ea4db3614bd6dcadff91eddb/37953318772.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/sakawagetasifozizeda.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/vowobatuwa.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pezirajipatijupebubuka.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160769356f368d---37763591444.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/diwaletorexojeg.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/tcc31l6461f9qv3stbgb13a2h5/xefizewuzug.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aleilck52se050irmt2aho8l67/xurukisopasunafe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ursula+le+guin+always+coming+home+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAB 19116 bytes
SHA-256: 4f381ab0736fb9a64a3554e7d54e17455c1b20169abb244e9fce66fde8f5f0de
font_01_sfnt_off00016d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D30 11276 bytes
SHA-256: 80f0856c025ef1b3bb471497c5f7ecb5c0d30c6eb94315ec0012df5e8f716008
font_02_sfnt_off0001874a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1874A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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