Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a5c11c5e504af6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 15:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 42e9bb898912671fa99a31dda829d6f6 SHA-1: 044a6c5c76df222058c71ad768bebfa72df458e0 SHA-256: b0a5c11c5e504af639122a3ac96804e948be9edea11a554cff649c9e114ca969
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

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://tongrentangthai.com/UserFiles/file/jekirizajodija.pdf In PDF document text
    • http://bjaimama.com/data/upload/2021/09/file/202109081352086602.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/liwesaloru.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/55941195602.pdfIn PDF document text
    • http://otestmanager.com/club/data/userfiles/file/20210921160215.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/bumabuxax.pdfIn PDF document text
    • http://sdsenlex.com/upload/files/madopetiputoxeja.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/gizovonivakarir.pdfIn PDF document text
    • http://computerdoki.hu/user/file/zajenozebapukil.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/4f70507145a9d436d81d80e194254082/dutilujaduvuzuwazafebux.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/40462807653.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/59614534730.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/83602038220.pdfIn PDF document text
    • http://mosme.org/uploadfile/files/90638586986.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/wazopibenoteginevi.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/rjab1q4gb68268phc7qm90imj6/77429435726.pdfIn PDF document text
    • https://soenen-pneus.com/upload/file/legidelafobija.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/kijotibed.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/969a679852a82237e98fcae7509d863d/65608184327.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/gexisukijenodorasazuxiga.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/90695952347.pdfIn PDF document text
    • http://progetec.org/userfiles/files/pisolamirudogel.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/gofibavazojovimezanu.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/lozegomoginot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=top+war+android+1PDF 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_off0000b066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 10044 bytes
SHA-256: b0ad8a4ac916136f44ff8fbb7ae320be320bff147c365dedde0085a47d466e73
font_02_sfnt_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 16248 bytes
SHA-256: cbf6e645c0d85c47f3412550f7c10fd878326b1fb58389e3503a8c91b6537487

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