Malicious PDF — malware analysis report

Static analysis result for SHA-256 80969d9be6daaeac…

MALICIOUS

PDF

73.9 KB Created: 2021-09-08 06:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a0f0cf716d0c63b331b556f841dea33 SHA-1: 9425db4bb6c0fc5d0dac5418e4d9c54de9b6c193 SHA-256: 80969d9be6daaeac865cf39ac1c2dda8b36df45997bfc341a8a64e83c4183b13
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of a link farm is sufficient evidence of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cructi.ru/uplcv?utm_term=polst+form+pdf+nebraska PDF link annotation
    • http://banglatalkies.com/dynamic-images/cms/file/zelivipo.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/62960954841.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/25225853568.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/08689a5f1159be625ea4db85825ef39c/gelulenedefaneduw.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/12788215736091b6200d4c8.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ltdcd7h7u6q7e4nmj955coppro/niriguponotuz.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a1487d1ca---56616529189.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/nonifa.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/23bbfc0f4df9a7fde38cd63df1c4698f/52158933913.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/7nel2sgvaf36ogrk89r0br8088/17499556988.pdfIn PDF document text
    • http://belovosushi.ru/files/94141157315.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/zupakezelemureguva.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/gajelovisopif.pdfIn PDF document text
    • http://soflocops.net/clients/81266/File/67549793421.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/mazofakej.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/20428979235.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/vexitugokuxupusij.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mdeq1pipilheum207clf64o427/18167622782.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/pikeratirisibinopuduf.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/22343698265.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u0vbl17rppag1gavt76hgils95/89415516645.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_off0000c193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC193 10800 bytes
SHA-256: 0383f317a18b4b6704d7bf0ee9361e3c70c66151228cf5ee8d233bf734b4bf8a
font_01_sfnt_off0000da48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA48 15688 bytes
SHA-256: 10d144d2d9334122a1a5a837947d75958bce4dfbaa9e91b04ec5b2726e2e5dfc
font_02_sfnt_off00010205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1