Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e4e146f620bfa95…

MALICIOUS

PDF

75.1 KB Created: 2021-09-03 06:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a1abb1ba24de4a735042563520476c4a SHA-1: c3dc5abc8a7141ff135e4a8bdf6096feadbe2eca SHA-256: 4e4e146f620bfa9517de6d1d844543574f0436d9419c1d5780b70fa35aadea21
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites, likely intended to lure users into downloading further malicious content or submitting sensitive information. The heuristics indicate a pattern of using disposable hosting and compromised CMS uploads for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/795e35951f27752ac1f57f77ddc62922/95887333786.pdf In PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/dowezodududitejevir.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xokasos.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/jopotefajijokanuwuji.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/4cd8ee9575e88c9dd43d42fb86977d2d/74070139809.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/13775954611.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5ca00f7c00e6dc44c4cf99cbe88c02d4/35499750712.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/479bf0c6124390bc5ad20c348f61cff4/vetevosetireter.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/dinunigirezamolufuwiv.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c7c7526f2---89898905558.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c71c976411d---turajakudejowesaxube.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4f8ec3ac64aad9074ae17dc91547f9e6/fojokuserilusobekisoniw.pdfIn PDF document text
    • https://crpm.ch/ck/ckfinder/userfiles/files/muvisoxexixinawewa.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/kinisewufijino.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/lekan.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/16138004357.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/degafome.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ce0251b7eaaa71ca7cb05856d0a90818/kerozu.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/48022577959.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/kesomu.pdfIn PDF document text
    • http://changdahk.com/upload/pizavugevevetenox.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16110965d8bd73---kaloseluvu.pdfIn PDF document text
    • https://tocken.se/anvandarbilder/258/files/12041792788.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/tubekewu.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/nexon.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/mukodeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=mechanism+of+action+of+trypsin+pdfPDF 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_off0000c140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD957 10948 bytes
SHA-256: c09ce1f9f300bf77e6ebe639976241d381db75e88f6f7b0cd2af3aba1efcfefd
font_02_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 17076 bytes
SHA-256: 57a8414690db4e93153ddff92bbd9a0534cd3d8d20a6b58a40c1350b3f782e4b

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