Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f2bf02608b2199…

MALICIOUS

PDF

88.3 KB Created: 2021-09-04 18:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 553407bafb84175590f80d7d21723361 SHA-1: d8ba90fefb83885bb801a7ed2ee0a3571288a6f6 SHA-256: 98f2bf02608b21999fbf9dce489eb146d29ee48c9488b2bde0637db2fcc4ea0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=lumix+lx100+manual PDF link annotation
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/7165e8fca31b3ab541e99163e71a7717/42628389207.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/bnl3cr6mm75ol3jqjhur20m50c/tinidaperod.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7db980e39d7eab375633cd8a192d3a91/65434264151.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/23110537602.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160893e210a701---54739550747.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/safogisete.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/8aacbj3v0ifn7tqiv54cvopp7o/woluvilowibedo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/f18put36lklvts0pbu7s44se1a/nodubilukev.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/rudomavuviwewetuki.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/kisinexejimilanifurakuzud.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/1es7g4nkl359b1unvnovtuqvi9/timavuduwapebaxisamef.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/17b1c36309f5dc32c1ddea3933c22b22/60517264721.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/52288445406.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba4b64a2b6b---81962497393.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090bac8df33d---kategujulodulane.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/39565629230.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/85305598057.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/64415419813.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/06fef1ec5341d2f7f25bb5669a563d74/21203831573.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/selirepoxajog.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/33741107550.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/iponk2tmuhl53cv7cploj3kh58/seniwiwal.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/40397225754.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/63079819879.pdfIn PDF document text
    • 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_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 18440 bytes
SHA-256: a08fbcaafd3db548d9a8c53d5d960d9bd9ba6b36d724cc53cd3981a72fce6cfa
font_01_sfnt_off00012580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12580 9984 bytes
SHA-256: b821d1ad1482c1faa65e0e6016e50e833bdf76eee58dbea53a1c273fab301b56
font_02_sfnt_off00013b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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