Malicious PDF — malware analysis report

Static analysis result for SHA-256 fadb1d5efb47a584…

MALICIOUS

PDF

88.2 KB Created: 2021-07-17 06:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 87404bfd0ec7c9bec94b1dbe647cc555 SHA-1: 745e8f6d2bc251e725b353fa2121414d0d72006b SHA-256: fadb1d5efb47a584637fe8381950e45cd1256a078a14499a333972b79d8844fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used to distribute malicious content or phish users. The embedded URLs and link farm heuristics confirm this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/76528311611.pdf In PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/81195676615.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16090b22f0e73a---jinilimorugex.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607e59067a6ca---99864039038.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/4q65l513ka6b2cbagpq9tt58a5/60658224876.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a000e227183---90959101368.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/bimeropoboxejega.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/708dc7966c08c0d040b8dc674e3572c8/36392703809.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a039eee9b8---83033307715.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/lijujogerisokasuwegetos.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/96acc2ff5e565ff8153e15bca263a7ae/bimitalagena.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b661a3f1a4---savom.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/sevibiximulinabiripewilo.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/nokamegewale.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/faregudunekefap.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/99de68f42e770a1a55f3524cf51504de/sowapitazebemixogojuso.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/69805376198.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8d53c1e44e8bf8239c53a970e53d50ec/sewodefozofonumexosoxi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2882a6b4---85616232724.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/ch69j7atl9g43nd2otf23h0qm1/navubalijepudaxepuk.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608459a625cd2---popuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ad+copywriting+servicesPDF 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_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 17596 bytes
SHA-256: 92bf54050f92454c90e13a13687fee5817f729fca139575f0bba72c18c42e317
font_01_sfnt_off00012193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12193 10728 bytes
SHA-256: 286bc0bfd9a42f3754e9914f2d11ca5996ba62d5a1fe4bd85bfb8e27fd538879
font_02_sfnt_off00013a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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