Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e7c8c82b9419d7…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 20:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a87d07eb2f55fc86282c4fef331251c SHA-1: b7bb9f8010908de32127d3fde7471cf6243d6b43 SHA-256: 70e7c8c82b9419d70da4e4eba8a31a0562219694be807ccb9021733d3bdb3d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external domains, many of which appear to be part of link farms or hosted on compromised sites, suggesting a phishing or malware distribution lure. The presence of multiple PDF-specific heuristics related to URI and link farms reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://inwebjor.ru/uplcv?utm_term=surface+area+and+volume+class+9+pdf PDF link annotation
    • https://ewdel.cz/ckfinder/userfiles/files/93030676385.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/risomonidilo.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16120a39e6fcc6---gezofezupapiduvejote.pdfIn PDF document text
    • http://lhsclassof77.com/clients/34792/File/wamisiruxariwibita.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/63474014987.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021082021274776.pdfIn PDF document text
    • http://funperm.ru/content/file/fojemujamar.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/55491893016.pdfIn PDF document text
    • http://coclub-us.com/ckupload/files/70763828676.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf7d55a203f---fudizo.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/sekowovilijopaxima.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/4e6e42a324032b8cdbb018c9e1e478d8/vuzipegurilalulepanudad.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1694877b34---lokurofavebifefebojek.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/upae404993fhec3v9f763il2qk/22130176159.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/38642844151.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/joxaro.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/sobofep.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/42383099396.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/23878292348.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66db7fce1---83129407583.pdfIn PDF document text
    • https://linker.tw/files/22790720487.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc339a02f4f---55079031576.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_off0000edd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EF 11000 bytes
SHA-256: 913c52d3df5623df23babe24fa14d2463caf243af87fb3815dfe3b13e18d0b9b
font_02_sfnt_off00011f83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F83 19976 bytes
SHA-256: f47a165ccbc2a776e07f3776a70baf7229654069f7fce3539467241f970f8c91