Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a3a19d4fb21077…

MALICIOUS

PDF

84.7 KB Created: 2021-09-04 20:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a58e36b1f176fb478ecb79cae2e0318 SHA-1: e1345ed8a9cbe756c39029b77f9260e114f76387 SHA-256: a2a3a19d4fb210770720406d687465eee8c20c10b6c5ef2306a5ac78e13223b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. These links likely serve as a lure, potentially for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/cmhb48m523bcci7rep3u68i454/kikofasobezin.pdf In PDF document text
    • https://knurussian.kr/DATA/upload/files/202108201535237908.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/g5h8vkd2g1509b8bf1efarp6oq/16654742810.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nufovawijuxu.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/vubadutov.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/2c2fc1c290e4688e94f4971c780cefb3/52202990806.pdfIn PDF document text
    • https://kar360.com/resimler/files/tizuxevoxuwinufosonom.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102e053cefe9---kakuzuz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b080cc2116d---pajokijiresofonido.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/33778741563.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/82d3e7d5d8bf64558d8f7c4cebed5886/23743834126.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/51048075933.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/76673056316.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/60008526390.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd2a00eb61---wiparigikibimigoruw.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/woretojixutenakimupanukek.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/5261223106.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/1uss914acj6hl3uiaof0at5gn7/84258689580.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/dusebujet.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/79196126561.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/j9t0odk9u9qscriaj5t8krhokh/96466133478.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e8ea821a---59203758931.pdfIn PDF document text
    • http://crediramasrl.it/public/file/98075600307.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/31125871815.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3c578ba5a---fivugokugefuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=google+play+adobe+pdf+readerPDF 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_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 10504 bytes
SHA-256: ee5e414447c6a774aba77f8b3ad1b2989de162ec5d16e8814d4d2f7721d033a4
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 17736 bytes
SHA-256: e8a618d39734142a356098ca744a35b152335e84085b8afa8141b72aa1360194
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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