Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94ba19cf0574c89…

MALICIOUS

PDF

69.3 KB Created: 2021-09-16 03:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa6cd2e97df8d4a06f74b3ba876fdc38 SHA-1: 564885ffc03570d608e9c3b87cfeab9235ac8ea6 SHA-256: e94ba19cf0574c89bbfa90e64be1066a86488ac2672f29fc8406f6de0c8a1f39
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://trevorhannant.com/57704559734.pdf In PDF document text
    • http://mackyz7automotive.com/js/upload/files/zosirefagu.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/gowudariwizokupi.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a96e41008---menuduzinowezel.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/kafadud.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/dezamufononedavatevaju.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/pupalatukofumopebeparor.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/24559759283.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/32900428725.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/a3b2931d99c9ffee64c16d6439586b9c/61181166973.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/03737253f919ca518b8746f0f625642c/22365799067.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202109file/2021091319150170554.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/vemudasebonapigizide.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/pagodefiwinaj.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/71077822655.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5e03f0200f31256bb61bf703c3765d46/wiramitabenovuvoxukug.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/ruzelukupakifibob.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/95612810841.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/ruzidimaguxozolen.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/57632924005.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/36367479884.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/67190241144.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/xeposebix.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/51953483205.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/dudekilu.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/50137902355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+clear+downloadsPDF 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_off0000b3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E3 14500 bytes
SHA-256: f4cd555e36da9682f0a11d20eed72940e9014aea7072a3b68821b9ccb9f6dfc1
font_01_sfnt_off0000d800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD800 10332 bytes
SHA-256: 813e0d693d9accc54c04cba516316468a8a5b4c913853485d0856d58f4fcbb9d
font_02_sfnt_off0000ef79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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