Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b19531923b27812…

MALICIOUS

PDF

70.4 KB Created: 2021-09-05 22:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a2c8e26221b81de67c0fd38f6eb86465 SHA-1: 2ac0bd9035e23ce1fbb2cbde35e61d8db69e87d1 SHA-256: 8b19531923b27812965ccdbdc2a36d9ddea547606dc20b06da74270fada7da9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://windmill-bv.com/userfiles/files/tizij.pdf In PDF document text
    • http://specimport.by/files/files/15343891173.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/86109765445.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/537c14da7612989d7c5f8d1cdf929b67/mukabesota.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/34865761662.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8d80c84f4865b358f8331c9ad39f5a94/31184024624.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105c835af695---18195624991.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6d23b6025---2707761444.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d0b4d93ac---tebufexof.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/24783934220.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/66411005969.pdfIn PDF document text
    • http://bigxra.com/uploadfile/file/2021071721060273499.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/larubironibozogejov.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/5524822266.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/lagedapugofebu.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/23877729699.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/3992084621986f5d11046083e4ed4e7c/xawukudufumegofafabo.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/lls4ouofmleikcvhj2iqi6r297/gigijuf.pdfIn PDF document text
    • http://mesterek.net/tmp/gafigomopikeside.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/mogunij.pdfIn PDF document text
    • http://www.moyekolodin.com/files/70358695542.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/0p1is344qfqbt83173e9thkv8v/jokifinexa.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/30236507240.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/23604605651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=consonant+blend+worksheets+2nd+gradePDF 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_off0000b4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 15124 bytes
SHA-256: 1b3f7d2faebad55e9cc97224ab0b606659b4e0b90fa654a3327f6cb0b68eb237
font_01_sfnt_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f31d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31D 10904 bytes
SHA-256: b283556ad04881827a6df5a20d9bf5645774d25bf32fe63857547862317bb54b

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