Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e823286911c4094…

MALICIOUS

PDF

84.0 KB Created: 2021-09-06 19:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4f570f5fb098576184627061f681956b SHA-1: a72e9d32137641b642cf2acf4e54f3c35f52dd93 SHA-256: 1e823286911c4094fcee36a6e62d61e2dd11d8127e6463a7f407844285c21aa6
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 ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The document functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. This suggests an attempt to manipulate search engine rankings or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pingthye.com/userfiles/files/55637464873.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e2b7c0e511d317410133ea28f63cad38/99006364771.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f9741776bb49fe172c59c5133f7f392f/zizozabu.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/2716d86aa5ef26eb83c39dc6e4183629/vepafudoviravijoru.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/kigusagi.pdfIn PDF document text
    • http://screen.by/images/file/35702171789.pdfIn PDF document text
    • http://dges.in/userfiles/file/84011934144.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/simes.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5eadd0c6c1---25321774343.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3192f86d---nojufimafodifofavotim.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/bixaril.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f12c4565---ronomumojuwakinas.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/luxujetopezadaladalotanu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079518324f91---jetonuwuvobudawakif.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/4c02c2800dfe4fb9e901cc447a5fa111/35737482094.pdfIn PDF document text
    • http://cke.hk/userfiles/67357908986.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5da50d088---lepezuvopi.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624229917.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/pjfbaqmp89keupbb1uik99qol6/30261745023.pdfIn PDF document text
    • http://jfe.hk/userfiles/kazogowe.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/75797994016.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/c0np47o6crp3t6uuqlrmmushel/45499861298.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=high+pressure+manual+portable+car+washerPDF 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_off0000e30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE30E 17632 bytes
SHA-256: 2a274b2fbc83c6a9318f375805730599c9ecfd86654d7553d7e36c8f3d6aff09
font_01_sfnt_off0001109f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109F 11140 bytes
SHA-256: 6c81f4e608461d7c71e98d7092c2769f16ea359a2f437a2c7b86e20c145a09e7
font_02_sfnt_off00012a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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