Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7ecd9e3ccc2722…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 14:25:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 43365958d27b23a7569b045f0bff6618 SHA-1: 6a371d5f15ff311d1d74a0b3700636adfa8e9328 SHA-256: 0a7ecd9e3ccc2722bdb08b8878fb03fb7c736305a60b3881fb5595e3156b21ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is likely responsible for initiating these redirects or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://laduses.nl/image/file/rexejomibado.pdf In PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/dosuvufisosujavilibifow.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/bf1a3b0482d3ecec07f6c4cbf8e4ff6b/28146278218.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/bojefojuba.pdfIn PDF document text
    • http://thegioioto.store/upload/files/bulevisona.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ee414261f3f---gadutowe.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/2481814174.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/pozowowijopijiji.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/08234ec6b038e5b2cb307e796e63e310/duziku.pdfIn PDF document text
    • http://www.heksan.com.pl/file/81380599600.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836dbf14dc3---noragiwidopuregavelu.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f7363694d0a---banaviruzezipawenozata.pdfIn PDF document text
    • http://abworder.com/uploads/files/maduxoxofut.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/paredunatizuzi.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/vunetupetowebikovizade.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210623_41888CCFF1EF9AB0.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49747193317.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/93415110996.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160820fd07f91f---59958351894.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/13959840042.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a26d50d61---wufudedonupamuku.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608008ddb5327---99001524000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=biotechnology+advances+pdfPDF 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_off0000dc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC03 17384 bytes
SHA-256: 177b88255a0d899839682830347afc8e23aafeaacfd3728497bf977b4f675c9c
font_01_sfnt_off000108aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AA 11032 bytes
SHA-256: 0bbd4eadc822e3a3d83a28372ab655320e6c69481b75909c02924394adbdac0a
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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