Malicious PDF — malware analysis report

Static analysis result for SHA-256 e519586f7120f253…

MALICIOUS

PDF

90.1 KB Created: 2021-08-26 11:43:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: daf94f155eabb059b72e2f0710565ac0 SHA-1: 6b18b39dcb3d2b17767bbb7e2eb89d148246243b SHA-256: e519586f7120f25314ddd02bbaaffb413f55de4fd940d4079c58ea0c7864864b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba21d558c2---rodojijopovexu.pdf In PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073af521c0d5---jupudamodedewimevamutexe.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/83334038374.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb9da061b---tesokafutukumo.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/zemibatalowu.pdfIn PDF document text
    • http://qca.ch/userfiles/file/siwumasug.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210530151346_149856374.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/13510100067.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/geb6qnihusfvjkl4lqhlvj6mlt/96420470010.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/rewosig.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/rubujifipivubipamif.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c520528569445347a253225f990b9ec/73910157499.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/42389954134.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/28308084091.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8988aaa6cd---fuxotutepexabozogidudadu.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/dipajuzakedimetov.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/levikalazageda.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/30767851804.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ab97f27d27d---gojofula.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/85851243326.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/vawokodozew.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/79295848886.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f7160fe2---zolepisugep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=alvis+firefly+for+salePDF 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_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 10164 bytes
SHA-256: 77645b7d1b5fe61e37ed744ace44289ac4499690dd4fcbea2de6abb5bd43946e
font_01_sfnt_off00011309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 17884 bytes
SHA-256: b36e17ec0f2e01f2a72ddffa9660b8aa7733c55f91e6251b031a192559c8db6e
font_02_sfnt_off00014219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14219 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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