Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb2b0c8a08e34e41…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 03:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 260a2c01223938acc31907f3cb43d42b SHA-1: 508e413d9d54645795368ef023bf29bfbecf46f3 SHA-256: eb2b0c8a08e34e41e6ebb10cf41d21ed300f1e2555218fe7b65e8484e0661b80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification strongly suggest this PDF is malicious, likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://wills.sg/wp-content/plugins/super-forms/uploads/php/files/51f88148b84a8808635bfd0b23a37a29/74200344728.pdf In PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5a12cf65---digukipo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/wasujevuge.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/92bc1a1c0c3db5b21928c7d1653ed505/mevikizoxosijap.pdfIn PDF document text
    • http://askort.pl/Upload/file/venapedisikabamunog.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16099e224b40dd---koramajelaxogi.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/rivuvadeseloluwun.pdfIn PDF document text
    • http://abwrva.com/uploads/files/vabodupe.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607107174339e---pisopapilizuzuletat.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/56535676407.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2f189aaf2c6d2ac857d01ecce2896e2d/megako.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/87399709967.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/40199366675.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160769fec01280---jimeropigutoxatif.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/3678189280.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2180586a5---nubijopigawumarevimo.pdfIn PDF document text
    • https://noventa.cz/media/files/file/20322493349.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021070117060243.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/18726668804.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a760a58b12---13827235069.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/57696032929.pdfIn PDF document text
    • http://all-premium.com/user_file/files/zuvujus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=comprensione+testo+inglese+prima+media+pdfPDF 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_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 17588 bytes
SHA-256: 557545699b11ad3ca107786ef661d2264499c6a81d906bfd4490caeffd27e62b
font_02_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 10872 bytes
SHA-256: c3e8d21aeadebdf93c0ae6a323a2d9137c0b10165f6728e61a20a49dda7adbef

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