Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7195df2f60817de…

MALICIOUS

PDF

70.1 KB Created: 2021-09-01 22:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e1b8c0cb4f2647d87875ea3e84648c3 SHA-1: 3334f00c19cb4ded4ce7f59664d3b92a1883c0d0 SHA-256: e7195df2f60817de5caeb91df3b6ec36f4db005230c4dffec678eaae8ec4688d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, increasing the likelihood of phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c988e03eb2---1802140131.pdf In PDF document text
    • http://evohome.pl/userfiles/file/4984376643.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/99c1659b31ce80015dacb2aeab2ba1d4/85033704299.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee9d261d8b---58594693985.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/kipunajemajovuli.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a860862ae07---kiruwobuvumibesimuxos.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/14288b05822b630de16fc627c8b3dc6b/65442354416.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7cf59543a6fdfc8717ac529ee21e5426/murabedavawezidavixipopuz.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/ec37a90bf31a307b53643b85c12e84b0/wojonovokibadosefobel.pdfIn PDF document text
    • http://quetthe.com/upload/files/wifumod.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/93695901187.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/20555784624.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/zinobine.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/gujezurasep.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/25937095058.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/89186930525.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/talubopegejomade.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/ralufisijiselovivoroj.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe28baa768---65410159135.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb9a98877---30362996575.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/33179183216.pdfIn PDF document text
    • http://dges.in/userfiles/file/pituguse.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/33404852095.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771c114b178---xokaviladelagukog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=maine+beer+company+lunchPDF 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_off0000b316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB316 15592 bytes
SHA-256: 3e5c59e3ff512b2360ce1f5d6380ac39c7968adc0b80bbb8d42607e6700081f1
font_01_sfnt_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 10720 bytes
SHA-256: c6196439ac3b415d72a50b0d07367985ddaafcf43c8eea1817098fef033fe938
font_02_sfnt_off0000f347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF347 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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