Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec543ff258afb41b…

MALICIOUS

PDF

89.3 KB Created: 2021-08-12 18:49:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d5af1bd7df679fd4528d58420df49db1 SHA-1: aec295265e1968ca9871a155fc4b2b0cb1b835f4 SHA-256: ec543ff258afb41b974a282ed9f62e5166d7eae45ee4e640bb631e7c813e6f80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging a technique consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://huntic.ru/uplcv?utm_term=body+reset+apple+pie+smoothie PDF link annotation
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/r2ene1sq8m3m5uk4gm19sahq3i/8442513015.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/mefaga.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609ced16bc452---datulasoniwabebimebil.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/nixip.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/vibajoxeja.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/jixivufifugadij.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/loliwijo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a822584cc59---xilukefifumefalo.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/wulifipevozajanuzofus.pdfIn PDF document text
    • http://dgjst.com/upfile/file/77716668859.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a77d3a0dd31---xalidotifurumasofa.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/75397953275.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/98196362487.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/33666323526.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/dadefenam.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/mefav.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b761064126c---vipifiviwosu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99be13bae---mabagovafaku.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076305939be6---safuxebasagiziwebeg.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/7221597659.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/sedewiganudabowegaduzogaj.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/384a6c628657259139dbc7ba4997047d/81127133901.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/mekiwog.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e3345c10f---35222331824.pdfIn PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/81765115019.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/550950aa7fe732708868c5297dfa23b1/70646982125.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_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 18800 bytes
SHA-256: abf2d068b9bc54d1bb8460fb586300b550d5f232ae29f459ff63cd59bb8163d4
font_01_sfnt_off000124bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD3 10720 bytes
SHA-256: f6752fb9e5cc82054c39727f89980cb6e30d88d841a6e216e7477304881aa54b

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