Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfc3015477e995c…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 13:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 84881dc90790f8ae00fd2f9ff08b17f6 SHA-1: cd058589e978e7d0d4b64bdc3818bdded0036ef9 SHA-256: cdfc3015477e995c52d50e25e00ea82799b3e48f76c127fddf7d6578165ceab8
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 exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://philabc.ru/uplcv?utm_term=microwave+components+pdf PDF link annotation
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610eb4e0e72d3---82071577012.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/wopasowakagubefosil.pdfIn PDF document text
    • http://flomojapan.com/upload/files/zanadib.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7f3815ce99140fe748a1929d1ef75e80/zanirus.pdfIn PDF document text
    • http://cwesp.biz/upload/file/togijakuvi.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/1cc514d9188eccc3cde488558e815c4c/guxidiwuxoxutotinamiweme.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/97784184647.pdfIn PDF document text
    • http://sun-eko.eu/files/file/50033311677.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/rilusuvolitukupolavu.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/zuludupetopuverov.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/7efpbviuc9pfs88r9bpdp8mbod/99770673384.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/15317778713.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/71423901967.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/68459904326.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/zafizikozewuxelaxa.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/marux.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/putoladumo.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/60735988100.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/misusivareguxiborawuxo.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/naliteb.pdfIn PDF document text
    • https://bliznacite.com/files/3658046967.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/kodif.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_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 18036 bytes
SHA-256: c65da22d0d090ca8efd68e5f21d0aed0ba892db509363979b61c6f89ab701478
font_01_sfnt_off00011deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEB 10880 bytes
SHA-256: be04f042875879659ce77f19da351dd8f49d999527d9abd55e7cea3b3fd150c7
font_02_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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