Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a8e4359f32a33d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 02:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3becb7d9421b7bf31d2ea2de7cc26772 SHA-1: 4058aed172abfe0bf9ae4a345f7face6a674e2d2 SHA-256: f4a8e4359f32a33ded353442c301d37531b7e0fcf271d8868406a14fc9d5449b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the nature of the PDF and the presence of external links indicate it is likely designed to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/55johgjfuak6qclkhecko404m6/24007777431.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e7019cf22---2084652855.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/f5547f4d0c29c0758d61703dee7649ae/21220552064.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/dirik.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e6ae4c8214d532e2692e0f307456a143/40322629123.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/4ad90eeef8158d181484e59f36b9694e/83120465900.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/3548925642.pdfIn PDF document text
    • http://benetalent.com/upload/files/wagakuxeregafojo.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/bijavipuxivokod.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/sonamibasemizovelibosul.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/9082843626.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/14oppomuecfgatiks97u0o8k2e/ruxededoxemepom.pdfIn PDF document text
    • https://cartolmania.it/file/jokixigut.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/xevuwabuxiwodebu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/fafadopivikesina.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/76759362223.pdfIn PDF document text
    • https://balarampurblock.in/ckfinder/userfiles/files/49568005435.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/92558838473.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/65126097428.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/91130461500.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/bewukezivuwezonoz.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd3425db05---sajelabipepodozorugaduko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=marlow+pediatric+nursing+pdf+downloadPDF 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_off0000b3e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E4 15508 bytes
SHA-256: 116118b13ee42ca6d2c331f0084dc55d8f36bfca7a51baa9bf56cc8cd6b8d70e
font_01_sfnt_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 10972 bytes
SHA-256: 955bbfd47ff2ea5ff74cc087357a91c4887eb8b100151842a3aa12f780bab22b

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