Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa158eaefbf8084…

MALICIOUS

PDF

85.9 KB Created: 2021-08-07 18:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9100d54ebcae8c6fdf4b835842057e1 SHA-1: 08cfc01e927595df18428ad524d3df9e57443cd4 SHA-256: 0aa158eaefbf80844f688d4d64c1d87b094c9acf7652a3a7ee52c3030b47cb43
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and potentially malicious URLs. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=how+to+register+tesco+clubcard+online PDF link annotation
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ac18d3cea---worevigerisutaz.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/o1if3stp3a5qkqn113kg87d17i/58891711346.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d2956d95d3b---1566460820.pdfIn PDF document text
    • http://cissi.it/userfiles/files/50098671349.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/mokixobi.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc352edd5b1---60543315674.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/06045859cd12c510e799cc97b3818ac4/57332311875.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df639e4bdd7---rofanovafewasifapiru.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fe3117591---dimenexenukapileva.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/geditiminozimukelukalo.pdfIn PDF document text
    • http://thongthien.vn/upload/files/57025470736.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/buraxejarexixuguvezajepo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46c1597a80---81798334055.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/knqc1d5gdo10abmem90o8l97nn/kukakonet.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/0cjeig7h3a0qlnfckdailasm66/56349037306.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/5c3cf57c656fac5ff761f2fc44b1e795/73492120488.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/40651578643.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fed647c7c4e---wovenivosurudebonobawe.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/1511ea2fcc77f13a598ce872033cf95a/13065880639.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086e35fa3c3d---mamifasozefeposixovego.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pewil.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/pewuvimefog.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/77480476170.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc046b2a54---xozun.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_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 16612 bytes
SHA-256: 4a89782eeed3fe4b97fbbc34150ff57d3d57150e86a0167f215a4b97c33cda34
font_02_sfnt_off00013040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13040 10864 bytes
SHA-256: 26c4f694759c5836d63f99abea47aebb264635dbf1802a251b7aede1befc0991

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