Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4486e8746f4bc5…

MALICIOUS

PDF

97.4 KB Created: 2021-09-07 10:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 38130e6fca9f61a50a61c72305a9553a SHA-1: dfd0591f60630b8944f2c574f5d39e5970aca8d2 SHA-256: 2d4486e8746f4bc5a202349e6221d9eee68c6f6f9607c14831039a3e7bd646a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120751b5bc50---samurokenixevinixumaw.pdf In PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c68f3906b8762d720d3fb01ad4ada980/61121387220.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/fb27568a1eb81f3337c84e0b692c68f4/19258004493.pdfIn PDF document text
    • https://menu2uplus.com/images/file/fiwonesegotipi.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/38458147186.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df18654e0d---dudilozujukuvijun.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/37246503757.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/53e04f74d7fdde4c300744122008ccc0/nedexir.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/83305644351.pdfIn PDF document text
    • http://come2menorca.com/images/file/99683199150.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/74537325383.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16123b135ad405---60703536260.pdfIn PDF document text
    • http://jawarakreasi.com/file/vubuki.pdfIn PDF document text
    • http://sksound.com/userfiles/file/wogesapuruv.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/laravapizulen.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/unlh7sro789jdl1ua5tug90in3/pakakejalanirafubeniruba.pdfIn PDF document text
    • https://faceless.me/userfiles/files/begebovudixolago.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/nojubewawavawenebo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6d09g839j390ds8g9dn0cq8a62/76228063432.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/11622535340.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/11996724948.pdfIn PDF document text
    • http://parkingparts.com/Upfiles/file/2737579160.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bc27a2m3rdhvq6vjmjmdl2glq5/21244042111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=national+defense+authorization+act+for+fiscal+year+2012+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_off000110e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E1 11260 bytes
SHA-256: 906c522aac985c72a80fb581d06ead977c0437e30be70c1f7dc0aed0fcf55d00
font_01_sfnt_off00012b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001437a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1437A 19732 bytes
SHA-256: 35874c9bc362cad3a0ad4d1d5fdc933f60a60da9f81ebe2cee5044e7b75a6291

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