Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd8b5244e69617a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 14:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a4b17bd52dc384f1ba8c95389245d8f8 SHA-1: 6e1cf5f78612887dde03c8a548c9254fe7556aba SHA-256: 9cd8b5244e69617afaff5033258b267422a5aa0a5d32b80da9ed14dee724538d
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites and disposable hosting, suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://someteme.com/archivos/_20210617190036.pdf In PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/rk1imtvdoqjaaimfger7tn00um/nobugavixanefobewunixegup.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/65613404067.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6kg7s8memoq9gmthmig2832n0c/nawusawi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116d22658a64---dufakiwijopepuxibope.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/pofalefimoxowarutaze.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/p587rpav55l4dvdpiu2js5lcon/kiril.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/62672116704.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/69255425902.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/8587729655.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bc00b481377---31469700750.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/vu5moin4ndhj0f1uis6oc0uqms/83916517367.pdfIn PDF document text
    • http://www.neocota.com/fckimages/file/liwiwexesexunepobagekajub.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/jijilukuxowapigejowe.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/tagopitimemekebezivo.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9ecd0d9d8e60037a93a70426ff817aed/mokuxevuxisavojovaz.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/96765714696.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8c27a466c0006012eb6345ee174a1dd0/logidejivufo.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/69806749167.pdfIn PDF document text
    • https://miet.hu/kepek/14200296845.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/90078e005524558ccca5b6e107b7c747/sigowufowifozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=effective+communication+techniques+in+the+workplace+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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25B 16980 bytes
SHA-256: 6a5d1f89f637471a6631fc51ffc02157c414055edfe562a8d521ec884c45f7e2
font_02_sfnt_off00011e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E17 11356 bytes
SHA-256: e66a717ba5ba912f415f33189073cb3dad29796bd604fa218de49665cbc69acc

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