Malicious PDF — malware analysis report

Static analysis result for SHA-256 13ff4bb69989aeb9…

MALICIOUS

PDF

98.8 KB Created: 2021-07-02 05:24:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: efe862ef0926e8fcf01ebb5591550eba SHA-1: c9130530d0bb9ff5288c1fc20ff5095e04a97c44 SHA-256: 13ff4bb69989aeb952b331e0ecfc155a9db0156bf1e5b56170b04c002eba3400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or exploit vulnerabilities. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9785

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://waterreducer.cn/d/files/83908894488.pdf In PDF document text
    • http://tunesistudio.eu/userfiles/files/jununupuvefuwifijamug.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/96932915846.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8461d98084---45677034639.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/xutoxipijilexa.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad6e2a0708---mijulugureberux.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/503f6b9a0373a3d2aced1d28f17f05bc/15416744859.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cb699beb4---xosavixapigelukinifemugo.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/cd5b89aa44eae3aa74291d77086323e2/19598242613.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f919405abf570d082ed3e8b0259f3455/93222697887.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/95959569708.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607088670c045---90403887529.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/kozanurimovol.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/juripatufifuzifov.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/78571988976.pdfIn PDF document text
    • https://tepihtrava.rs//files/jaragedaka.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d821d1e872---47939163021.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210629_0C598587B239976F.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f9a7f87113891b7c68ce8856871abe00/52321385965.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/lsjcftuan9kem4jt60v822jof0/33425631067.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d0e902e9051e2ecd1b568bbec06bf679/suxelazezep.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/jiwizu.pdfIn PDF document text
    • http://dentherapia.hu/files/file/15858191188.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/i9mbtmdvbq4qja04ej8ctaqoma/xotab.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160783042993c4---74353327042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cardiovascular+intervention+and+therapeuticsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 18104 bytes
SHA-256: 43640e88898560f0c43ccbb4e75fe4b5aef825d73d036cf7974abaa7654bcbdb
font_01_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 17948 bytes
SHA-256: 1ae67903e53d6942355d72a14e0deb1656acee0fd21635cdf5a305137dca7040
font_02_sfnt_off000131dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DC 6576 bytes
SHA-256: 2eaf93165145b8d0d562c6a8b12db594947c0b68862a08f93034f326b7ca625c
font_03_sfnt_off00014927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14927 10808 bytes
SHA-256: 5699f0e58e9de972d3a89ef96e0c902e190e6ae4aa77d8a0de9475c41b12238b
font_04_sfnt_off00016208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16208 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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