Malicious PDF — malware analysis report

Static analysis result for SHA-256 27f44a7272d842ca…

MALICIOUS

PDF

81.6 KB Created: 2021-08-17 23:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 038b13474fbdb6cbf859c44cbaa4716f SHA-1: a0d35b0cbe2ee628f0aca3ae978e749a403cfacf SHA-256: 27f44a7272d842ca0316d6b34cd5b77ec3de3ce0af3d370ef713dbf636df5340
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. The file contains a large number of external URIs, many pointing to compromised WordPress sites and disposable domains, suggesting it functions as a link farm to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=cat%C3%A1logo+hinode+ciclo+4+2020+pdf+baixar PDF link annotation
    • https://kltccompany.com/ckfinder/userfiles/files/viraw.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/76787bdca1d4272c7d6e3a97e3f449fe/xebapinadawo.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/93299488160.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/46ca2312b9fc2453d3274a7c6f5852da/99712509127.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2682c3a761107f6781c7799dda192917/21260657354.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c40e8947a7d---luwoxepikelunujedi.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/38259893891.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/3ca218308e5895dbe87e5f27a7134db6/37389787369.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/v5202f8knch23urd2td0arpet3/xapobawanopamu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2ee84494e27b946ad79c7a906178c12b/53881807935.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/3117536542.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607184448f99f---dukirefozulobagavib.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/64577056288.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a73d0cb22---rifejigepelidileseje.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee8a8f40dd---kokili.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/b62371565bbc6bac625258fe2e308e52/jevepedepajunodosa.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/80900671387.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/rukrhjrr28h15tkr7si9j2e3hg/kizewimaluwakib.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/73843617123.pdfIn PDF document text
    • https://aedwea.com/upload/foto/duvokal.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/68171179253.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160830eaae5ad1---desesufarub.pdfIn PDF document text
    • http://xinyuemu.net/assets/202107/files/20210714065617487711.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_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 19172 bytes
SHA-256: 68e1cd3f0d1d9776aaef656f8c8f30ece5ac219b7c447bc0e7d18f6354a70f0a
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 11504 bytes
SHA-256: 3f068db9528d8b9aaf65c5b9ac608e2310443db6b86110110636c3994ba3f66c
font_02_sfnt_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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