Malicious PDF — malware analysis report

Static analysis result for SHA-256 abac06f25a641086…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 06:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5848f4ae2545a32dba55b51046460ccf SHA-1: d4e11861b16ffe60fc04471faa819ca10a405fec SHA-256: abac06f25a641086497592f7738ce85f999563112e3f7762a1af44efd73bcf3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites hosted on compromised CMS platforms, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://kystop.com/wp-content/plugins/super-forms/uploads/php/files/b514414cb1e31a26d446773ff8622401/70109857217.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/i3oabtu9iln7ecao8gnm2oh26j/86574987643.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/mabixupelilodal.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba193a15ede---30916403262.pdfIn PDF document text
    • http://sivam.pl/files/file/jawaduw.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210730215714_grxtoy.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761d30e7ca6---wisumaxudijeb.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ku31c8ktf1g4iges6tejab73g8/vopuzanuduk.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/tufatukofiruduba.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/5ddla51hf90dvimbsbtlesak2v/39634764999.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/wetejozupilefogobosisolad.pdfIn PDF document text
    • http://labonguyenhoang.com/img-chamthi/files/98802879811.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/dda49299013b296dff3def7c002f5b79/96171162075.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/9456643960.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e7fb054d725f8f1f974a0fde5f5dd8d2/vikifuveg.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/27130879970.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/61466889832.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/nedinomudojanuzu.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/95710046603.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/26270718651.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/a25c609cdda5e6ea46a52db9bfae4233/xopaluda.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346009dff8c---23191791149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=macrolidos+pdf+2015PDF 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_off0000b796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAD 10700 bytes
SHA-256: f0f25368b5574855992d311ad496df2bd4782e378627844cd7f1e0aed08e52be
font_02_sfnt_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 15560 bytes
SHA-256: d10fb005b8452f74f3251892e65a2be7e395964ed3e9e573ffca17cde33e90f2

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