Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51014fa2a3c468f…

MALICIOUS

PDF

100.8 KB Created: 2021-08-03 08:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 120a3024ca4ab924fd7b0d7cc4e03720 SHA-1: af53b822d5f612b6f43fdb6eb5b012e429e71e7d SHA-256: a51014fa2a3c468f0f45c956335c6199f406d5f48583753018e3f8d20c20bd5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a link farm pointing to compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute malicious files or redirect users to phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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 https://esprimagroup.com/userfiles/file/zodujilupibexawurojizo.pdf In PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d999e056f1---wixarotetej.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/8f2kbdn6ps87n8cim1bscjo1dm/pofuvejuvapifawarema.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/fsjiblb0gonuvvs34u9ubuelv2/sokenevisigixen.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c520528569445347a253225f990b9ec/73910157499.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/53a2966f9d3c65caa56c57d15ab7c26b/guninozaw.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3cd8c7f8---biruxefarirowerudupa.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/80960139794.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/29770953982.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/zugiratawi.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/vowazokoral.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/20885d568282e3ad5c852fb3365c18d6/jizorazanobo.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/jigegazataxek.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/bb0c60a5aa14c0318cfffd487f752a24/jogixamobefanujudizoso.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982a2c36f6b---pezifejujodopa.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e8680b5666387e86bbb1d5c829f33dec/metom.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55ba68964---66871558887.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/82189279418.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9b4bcabf6---wajekivipogu.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/biluzejis.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/08b96dd2b005573eab14510224bd62ad/sovenejiruwivares.pdfIn PDF document text
    • https://knjizara-harfa.rs/files/97343620652.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/78609300829.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/pujewaluxinogezow.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/8d821dea4bb72dad93a858864b3b94cf/xowagibinazitefakuzaso.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19f744e56---43693758299.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/67317538066.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/88265722945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+most+expensive+hotel+in+nigeriaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E3 18664 bytes
SHA-256: acbbbd822ffbc97aff5ba91adf162da7902e8deb5047d69eddb4f00c0a807d75
font_01_sfnt_off0001527a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1527A 10832 bytes
SHA-256: 30e5690119b7d8ebbd7c455f7a433c656239d0e96566699bb10fc3256de3e7f0
font_02_sfnt_off00016b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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