Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a6d45e3418fea4…

MALICIOUS

PDF

89.4 KB Created: 2021-09-06 19:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e342e10a5d2d2dc3c3f51dc8f245ea74 SHA-1: 3d77b6c6efb715ffb81a03e67260b0b5ea78827c SHA-256: d9a6d45e3418fea42a0e28a68d271f353efdf47a0a6205c7de8137c0ae40aa54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of numerous distinct hosts and the use of 'utm_term' in one URL further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d031364308---49357610715.pdf In PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/8369bff6c65ec2b5f473f596947729ad/48357635440.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/44636076749.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250e654f426---82919129398.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b79a9d7a835---sepuxi.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/30589642792.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5c17bd88---dinadixixiguxoruvugiga.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3cafe0788---vifemuvavekidematusopuwe.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d421f6ff44---savanogofofibovo.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/paxete.pdfIn PDF document text
    • http://lws-realestate.com/userfiles/files/pulapomidogu.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612e35122d6cb---17904974547.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/jodideremizopola.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bafc19292e3---mirofoduzorafonik.pdfIn PDF document text
    • http://sciattella.net/images/file/62629490408.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2246c28dd7---89619358626.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/xewuzajimalalex.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/27403343825.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2fa082c13c2ac0cdf623e97e0b0156c8/fesuxirik.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/97342969326.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/xiribulutiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wbsetcl+assistant+engineer+question+paper+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_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 11176 bytes
SHA-256: 061c0e80a4377155cbe3811ee369c062830e4122d04231c6bdc6c504deb7f7e8
font_01_sfnt_off00010de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 18880 bytes
SHA-256: ede3bca57f7375f63c104a3a57d16a990f1df31d43c0c044bd61b7027763bbb5
font_02_sfnt_off00013f7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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