Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f238db8c5358311…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 01:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 084b004dfe937a74e81c33953348a7ce SHA-1: a9b02251906084223748d215153dcc2c598f36e3 SHA-256: 0f238db8c53583113d515b8412d21b3fb762af12e8af678c99aa1d699e971327
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 a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious or phishing websites, as evidenced by the URL patterns and the heuristic identifying it as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=drawing+a+scatter+graph+worksheet PDF link annotation
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/96es91qrg123sf84ouppv0rr00/51417271706.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/litifakipos.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72351874928.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2661a060cf1776317aabafff365875d4/munalezomafa.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a8f2e4d2---68895507540.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/dc7c3402c01d7ed46da25769d45de717/70718834558.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/gegagerekibu.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c673ec73ecd---98640299425.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/7ilj9rl7932emjiq24e9iprm57/fonavitujo.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/gojasulotuben.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/tivizuvo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16110b0061beb7---59608701547.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16099caa0f0175---zapifimudagel.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a13b17969---nimaba.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/liverapi.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/kajafekifusisegajabixe.pdfIn PDF document text
    • http://www.heksan.com.pl/file/4390991559.pdfIn PDF document text
    • http://nprofit.hk/userfiles/dofegixitomepatet.pdfIn PDF document text
    • http://voijin.com/userfiles/files/lazudunaperixajiw.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/0d1fa57888790413c454fab1a13669ba/vumokedubafatefizibidir.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/14522920865.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/7o12c00ud5a20juvi7mqnt814b/nibivakivowotomogafeluj.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2b413501d701b83489fcdcedf4ef7209/sesufotuwitodi.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/33386277420.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_off0000d590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD590 16580 bytes
SHA-256: 6bba1603e70004efbf1dbb8f7c5289cb735711332407113a1fcf038d75dbeafb
font_01_sfnt_off0001000a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000A 10784 bytes
SHA-256: b4567d476aee2e9fc84fd14b2af0f79352b0c19409c1f2026f61610b24fd5a02
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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