Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfe7be85de70a336…

MALICIOUS

PDF

88.5 KB Created: 2021-07-17 14:31:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: abfc1f6db86f11bc9d2fc68e590921b4 SHA-1: e8e369a0860bd35591f2808066c2fe43d7dcf5c6 SHA-256: dfe7be85de70a336fa834ceb2aa33fcae03ab418271ea79f37a0b7b77ff583f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating a malicious intent to redirect users to potentially harmful content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution vehicle. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfde2654e57eb03c817cb7a88f6de1f2/bojopotavejuxeji.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80663b3c4---50752440888.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077f4f24ab5f---xowinu.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd42eb5348d---65067196052.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16089262a0ed8c---79154187451.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/1405cf6171cb4dad1859545b7082bc25/popunuvi.pdfIn PDF document text
    • https://interface-graphique.com/upload/editor/file/70603441630.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ldc874f6ngle0p9k46u436nndo/gojelozuw.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/1b643dc8825dfa23c17cba53f67b0041/7630131085.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/51f9776db265ae2a1d3297d59ae5bdc8/19814585814.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/84252024569.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6a8b5f2c63468816e71bca5b161730e4/ruxutoxipaw.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/natidoxojikelawesigej.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755c2c626b4---30058254205.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/72823371993.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/56284433461.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/qnhvees4ltaaf6vmhnpm9r4dp0/revupaj.pdfIn PDF document text
    • https://gamasteel.net/userfiles/file/62188867574.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/gipujoluvuporukifetebad.pdfIn PDF document text
    • http://bjjiffy.com/upload/moxiwoturiwolas.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e991b406d1---rubifurodewapujisur.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/dfd8d0ac5r11ol3lp8sg8l11j5/51519676549.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/vuwufogo.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89fafd60bf---mumidawuguzuxugilowozam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ad+banker+exam+answersPDF 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_off0000f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 10456 bytes
SHA-256: 4175abc7677104a22031b84fc102cc8074ceeb80bcd81275aa59555dc9050ac2
font_02_sfnt_off0001297a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297A 16656 bytes
SHA-256: c7f5fa17c3c5fb6b4770cc7052cc564bc4a0a471e432fef9317ed9a72a03d548

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