Malicious PDF — malware analysis report

Static analysis result for SHA-256 b874fa704b923018…

MALICIOUS

PDF

84.9 KB Created: 2021-09-07 02:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e992fa70cbfc606d154dc2da5743a44e SHA-1: 0d1748ee4268c32374c358d34578d7955148b090 SHA-256: b874fa704b923018370170201ed5e055ebfea49bd0f9de4b3c27ec506077a50b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://absoluteanytime.com/media_file/files/files/98859287916.pdf In PDF document text
    • http://patp1ryb.ru/media/file/88646854815.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/50772194070.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/nudinoxinozijuvulekizux.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078d65abb2cc---dabajitexif.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b85aa95435b---31964805922.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/dvg1mro9o7f3bnn0grfk7qhq45/97541419278.pdfIn PDF document text
    • https://digireg.it/upload/levowirenotomipakufubori.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f4db6a9636f---womurinigikemot.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/nisetemofadeziruj.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f0190190146b1405a372b298656f674e/dusudujoluwevabeputevu.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/718657407.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/n15q1k23juafcjugr1kltd9btl/wusiruwokegekit.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/hi4eaav0vphsn2ru6unfhqjscl/zafitolejanevinifima.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/30803399429.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac8f159938f---votakub.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/nopelazesevuwog.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/kebebuxuwolepavubi.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/mobuvegisen.pdfIn PDF document text
    • https://majubesar.info/contents//files/50119295978.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/napibukatuvovepunoxasaf.pdfIn PDF document text
    • https://sy-tech.eu/file/nejevasexibajidenavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=canon+eos+m3+manual+downloadPDF 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_off0000e35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB70 19160 bytes
SHA-256: cb914d41ad877b5bd95b9b9bb5de514a1c2f02343ff55b5f9d3470e13bf90991
font_02_sfnt_off00012e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 10508 bytes
SHA-256: 03a9174d20c08a8f4c62b09a24615537293fbccdb35d1e3490ddd653d25d7faf

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