Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb7ac01ac31f272…

MALICIOUS

PDF

84.4 KB Created: 2021-07-10 13:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5d2a2cf99901c613dc3bc362fcc05e1c SHA-1: 70769c1a39982748b8ab7e911c54422887fda1ec SHA-256: 1fb7ac01ac31f272ab536678e0755580e99fd8eba12cf4605eb7e6d808770270
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phishing lures. The ML classifier strongly indicated maliciousness, and the presence of numerous external links on potentially compromised infrastructure supports this assessment. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/kezoraxomedonuvizenumexo.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd9012202---62065112283.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/bac5090577164eeaa335e382bc0258a9/8880827604.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/bc8c8a64ff429c7632f2555340884a72/jadudoligije.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/59904032745.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7e455efda79fff43d5e3221bc873a566/dadudetediralupimusade.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/2152538422.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/64847794225.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/fakevetajesemidabowejuzo.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/91894250064.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/3236331881.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/99879261003.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7ajse6v4ua0bv4hul8jrn1du01/75057715564.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160add278bdb1c---roxalomofelorola.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/jixomiduruluj.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/vogogujuxapukuxowalu.pdfIn PDF document text
    • https://ebooksweb.net/files/file/90168193985.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/22246936862.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/6da388c6ad2dd89a38beb3e39c6c5d3b/19642716928.pdfIn PDF document text
    • http://1984wnhs.com/clients/2/25/250e0aaa51dad033202e6c34d8602b4d/File/beberovosisuxozoduzisew.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/676c234a6817c2edd390c0cfc0d131f3/lozedawoborazizarubevisep.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/rijaxudozigepewafedojujop.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608b01c719cfc---96243586938.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/4d39462ceb3be848475d03c5172a804b/wotizuwolomebimewalar.pdfIn PDF document text
    • http://rybczewice.pl/userfiles/file/12237291531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cooking+oxtail+in+potPDF 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_off0000e92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10145 10252 bytes
SHA-256: dab4ccdfee3988ce26000fc011ca68d73b9ae0d4131f2926c54ed52fd16221f3
font_02_sfnt_off00011876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11876 16948 bytes
SHA-256: 6dcf63521cc1bd6925c3be3076e63bddfa15ac64e79906e34be0edb644d7b376