Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57e1fbf6b8f87ce…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 17:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12ec486bb3391178330790ebea646c13 SHA-1: 30399679b7e3eba169a7ad35633e878be81523f6 SHA-256: f57e1fbf6b8f87ce014a5f7d5528881ec854951747f40dbef4667380c85f5f13
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=pdf+renderer+android+example PDF link annotation
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613947c2afea8---89780869564.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/f25a61828a9361d61a13b264c15a6414/kezudikerabepaxewumebev.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/54e452cc3487754dd863dd2d99cd4266/dekipebakutoxogopuvukosef.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/8047682324.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/lujila.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/40458244420.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/90746113686.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/pawurogazitobugezadotegij.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/pomepopote.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/jepawe.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f541ccac9d---95642254061.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16139db4956442---30338793571.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631256327.pdfIn PDF document text
    • http://bastola.org/userfiles/file/giwekelixifuxizojidili.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vedaris.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a78a613f4---wasumura.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141840858868---42378025945.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/75127097752.pdfIn PDF document text
    • https://tarsiman.ee/files/file/3175993509.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/89300522628.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146bc16d82a1---13523442435.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/knbnl4sqv2o4f9h98sq90sdk6j/88371817999.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/34250872090.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/74876372984.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/89803149234.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_off0000bb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A3 16556 bytes
SHA-256: f0ac45f4df6863427fe62b8baded442f9c2eeeec4633e104739743c89778c1ec
font_02_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 10496 bytes
SHA-256: 741ee784b415c3ef86ba70e51f580f77fda22394fa14cad600b3e8e62c1de3bd

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