Malicious PDF — malware analysis report

Static analysis result for SHA-256 731cfde9316af498…

MALICIOUS

PDF

95.6 KB Created: 2021-09-03 01:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cbd092fff60ac0467d9f1bd5f434f8f3 SHA-1: faf3c94c3570f99816a274497d0d53e7979910f2 SHA-256: 731cfde9316af498ed4eb129a13217060b6ad2954293a879f913827eb1b65f43
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier clean score 0.2156

Heuristics 6

  • 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
  • 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://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/iqo1nrks6c7murtp947ic1u4uf/xokikolebudutabutopenubap.pdf In PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/87cae424ea120c7303a7f8349d7950a7/47434606992.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/e746c35cd62e6c0fb9ff04aad74d8156/wizuvedukesumejiwiv.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5d43afca0c4e9d8e46918c9fee79092f/52301968397.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/90389396071.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-1/20210501034825316419.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/35527125063.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/selakeg.pdfIn PDF document text
    • https://energooptima.hu/upload/File/1074238919.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/18954446949.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/48469818978.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22bdca537---60636827369.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/pozibod.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160eca42c3b75b---89835870755.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/45582141842.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f04c405e2b0---buvosimix.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/11628469139.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b54abd0a9d45cb9b77aaa2679a7d5495/2272970549.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/duden.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/86960042062.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/gosematite.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/28f4146439da46c9e523b18643155542/giliwimedizixofukemetoxup.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/gokonufes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=merge+many+pdf+to+onePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001625f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1625F 10640 bytes
SHA-256: 1d4182919f0bf6b39d8e931262fa6d36b62f19530e3995df72816b30c9e7617f

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