Malicious PDF — malware analysis report

Static analysis result for SHA-256 60cd7525fcf3b88e…

MALICIOUS

PDF

91.3 KB Created: 2021-07-17 13:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8127efba6745698238a2d8ad41b390c8 SHA-1: f0fe58c25722b7bb178f9397fdf7a1f88b31acbc SHA-256: 60cd7525fcf3b88ef7e7026df475d11aa2a3727e76d85338dd8e1ac1ec560b27
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external URIs and is identified as a link farm, with many links pointing to compromised CMS upload storage. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and numerous links suggest the document's primary purpose is to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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://edu-family72.ru/content/images/uploads/file/54416102700.pdf In PDF document text
    • http://mosjob.ru/images/file/36886041956.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/dcd5857b39aff2ff3758c961aac92b3e/15063718580.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/finofojekemibezef.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/24466540006.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/jidirarirenufojigufo.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/fivojaximipo.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/40230190709.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c8eb987089c651b66be9d084ae9173bd/disuvupe.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/jfs5vi981cgqkr0jq9lgse7bkm/gujevibosatiwi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/d1d5e2a8f63b846c875c16ca5784917e/5613512445.pdfIn PDF document text
    • http://citra.cl/userfiles/file/tivesowojuxinijipanawal.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d8a94cef3---81497766489.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a67b41294e8a9f83589d1b10334d7f12/rasewawapediko.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/83376529576.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160864eb076eb1---detizijibirodotuvujajixik.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ed8fc3dbd97---norasagopeminepipep.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/14d1a8a411156915e6175835268a5405/19784084501.pdfIn PDF document text
    • http://kovtec.pl/eurostyl/photos/file/14181606750.pdfIn PDF document text
    • http://sns.hu/_user/file/wikonemosib.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079fdf18d907---56445446753.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210512010945.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/tf65cvgdaem6a4iogk1v2l4hn4/lisigomejetuziwesedadori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=words+that+start+with+an+nPDF 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_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 10244 bytes
SHA-256: 51e34e83d9484ff39b830151f72f583e12e265a830df62c9db3c5c934107fb25
font_01_sfnt_off00011aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C1 16888 bytes
SHA-256: be07affd625c67ba1880ca474b4e67ea930bacef4867ba10533129c13f7710cb

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