Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e9a512fa6e8c28f…

MALICIOUS

PDF

94.9 KB Created: 2021-08-20 18:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 598ba69128da4eacf92575d98e6db2f9 SHA-1: 5b23153f2e6d528503ee2add315ce8dd3576d47a SHA-256: 2e9a512fa6e8c28f3aa489742e0d9aa867476facb735c9d984cf14bde1a2ede2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of external URIs and link farms suggests an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ienter.bg/files/nafukegiz.pdf In PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/55760545131.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/36032818146.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/88r6b9h2sjq5eit49f0cs5c9ib/28725012498.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/luzezagovizid.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/801e593cc62fa954e4c63e2ced3d8813/82265383164.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/c82f50851a03ae70469e8da99481dd49/44467863296.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8180de471ef3018b276fd42f069918fb/37665235251.pdfIn PDF document text
    • https://mar3ol.com/Files/files/kufaxawuzobomikisogijugud.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62d6d22ea---92046401336.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ep3nob0hstg1ru35m07ivg29nl/renoseb.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/36020194132.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/22acf1d6dcd4610a09467fc56da631e4/wasutekotug.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/lavaza.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1d1038242---30818953825.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/23984248469.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/dixazawuzevuzegugob.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872ebe65707---31803782170.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/ponupeperopudumopuvomaz.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/63895441910.pdfIn PDF document text
    • https://ferropula.hr/files/95496562930.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/tumuwutaxufolinefarowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=weider+8630+workout+routinePDF 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_off00010ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 10804 bytes
SHA-256: bffa99d9521216b2a77a748d66b4b8996172a65c4be9ec15c11b95b48fc337a7
font_02_sfnt_off00014023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14023 17296 bytes
SHA-256: 1a22e137c87e6c9f327ae7cb4719d9c89711bcddc1f1a49ba9bda48980e1954d

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