Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b718a0d3bbe128…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 17:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2d98848c364952a224825c9a16ba514b SHA-1: 216bffa9776b61cef3c42b6c52984d8d4209b512 SHA-256: e2b718a0d3bbe128a5b2418d9839f371f1f5aeaa8424e70b2912314840e71cc9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous distinct hosts, many of which are associated with compromised CMS upload storage or disposable hosting, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links strongly indicates a malicious intent to redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://dkmmotor.com/files/userfiles/file/jafedixewojifoto.pdf In PDF document text
    • http://capesociety.ca/uploads/files/86865313313.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/59249576209.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210617_102412.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/37b023ed48beb3d19b0e6ea816d9ed5f/4724152536.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dea785edc---zamokona.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/70836693909.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8fd018d6783135e49c23b66f3259cc62/16048165916.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/galuvebilawukifova.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/zugim.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/03gvp0t5bu5uj6jtm7cnbi0d84/benolonadadojefokuzur.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/26894520961.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de906b5b0b---nebegemexosu.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/zubelajajaxiraruroj.pdfIn PDF document text
    • http://ned.ru/uploads/files/zakujufegimuvamen.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/tewusisozixuk.pdfIn PDF document text
    • http://alltechsro.cz/files/sedalawezizupasujo.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/85651175883.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/pivisetobu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/9a342414f2273831d68abec8411b28a6/88886761784.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ce2dc84dd3344ad138cb121e2f27a29e/wudenadu.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/bf0a926ab7cece519386cdf47b957941/79759213664.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf6bf0d6dc---43326047298.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/34284860931.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/zurovewavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cost+of+living+in+gujaratPDF 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_off0000d4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F9 10584 bytes
SHA-256: 64105b59833c50c324775d2f7d76a0a9bdc71da2525c1f68bc8cb568f94337e7
font_01_sfnt_off0000ed3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3C 17348 bytes
SHA-256: 84e115ab8eeada96385560d1a5d59aba3eba5d13f8be59f750b9208fa938e2f1
font_02_sfnt_off00011a3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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