Malicious PDF — malware analysis report

Static analysis result for SHA-256 42004291646ffbbd…

MALICIOUS

PDF

77.8 KB Created: 2021-09-18 15:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b2165a3215337957718704f9e48b5cb SHA-1: 4b560dee0dfc6c6fa360b501550c9517c4a5c2d8 SHA-256: 42004291646ffbbd5129d4a935304e99ea9cb63c4886437e8e2952ba73f92b43
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcd0f5059e---rapujidiwowejibugi.pdf In PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/c38f516079aacc13df2262fee8d54408/47595477676.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/zelinetugozedupeluvivasa.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6880a0fcaf58c6f602295e772eaaca55/pidubina.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/nivexofatejerutanubosexek.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/86671173850.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/30052844009.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161422dab62173---gatajulotizusavex.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/vinuwugopilukipu.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/67029503446.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/zakevavujevilejuwivof.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/17865785200.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8488a91951d2f720189da416ef578bfc/31156184042.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/pababosorazawef.pdfIn PDF document text
    • https://susta.vn/userfiles/file/60132283179.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/xesigufo.pdfIn PDF document text
    • http://marketingnews.fr/images/file/30338800340.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16141a1e531218---20605615232.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/mixep.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/78007855994.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/kajinozaletisemumezaro.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/43159800751.pdfIn PDF document text
    • https://fcimoveis.com/imgs/file/9073261594.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/vuwosixajosekonuperita.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/sizapudiza.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/42338094598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chromecast+app+for+windowsPDF 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_off0000cbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC4 17224 bytes
SHA-256: 0418267a314eea7ebb45c2ca618c97a13a044955414b3e0f599f19e95f31fbb3
font_01_sfnt_off0000f890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF890 10956 bytes
SHA-256: 2ec0623b86082d574c76f0310d72d8b7d32118d00e6c39fd6b03caf16719e839
font_02_sfnt_off000111ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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