Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90021af9d86e662…

MALICIOUS

PDF

111.6 KB Created: 2021-07-31 04:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6aaab67a5f8077218daa25b99fc641bf SHA-1: daa1b76667cbeb35bce146b2a67afc09f1a3dff8 SHA-256: d90021af9d86e6624e74d40d3c328c5e347e3cbb7337bd2cd8f0d2a92c61accf
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and potentially disposable hosting, characteristic of a link farm used to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure suggests it's designed to lead users to download further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9385

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://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe143a8aeb1.pdf In PDF document text
    • http://akcihlar.cz/userfiles/file/fisazenuxezunab.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086940165ee9---73580451362.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e8720680a618a74de84ee0934fc75cdc/95061239050.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/vazako.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/salizomasog.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5dcef004861b82a1eec4f93d325daf4e/xemebisonofeketivu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/k65akd0q5lfgeuc8fec4mfi9j2/54352802354.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/peloxejofedav.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/tonirejuvexiz.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd18331eee---59693482987.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/muxejenabod.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/45a7bcae4afa2ffc4f4fb7cf50c32a07/10043840080.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa98d3087c---16807872823.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210725211916.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/93667574639.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///61070555275.pdfIn PDF document text
    • http://12shio5.com/contents//files/jizeguledazedufenopoliza.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/puxawulidorugupu.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/jomebunizedebu.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff33129458---zibubuxunagojenurekeludux.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160788b5bab4e6---fesozu.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/rijud.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161046e7037343---wupagodinebef.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/3181632385.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/19074374309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=solucionario+matematicas+avanzadas+para+ingenieria+zill+4+edicion+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000124cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CF 22000 bytes
SHA-256: 1e72297c6beca24c62682ab1ec8ad1d6acc2490cf0fa079e052bd1fb1311c5ff
font_01_sfnt_off00015cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CB7 16144 bytes
SHA-256: 319c1d6b5a9dfe45ef2c311a2d5ba00a192ff2e3c7a2103ac7a27dba584f9d59
font_02_sfnt_off00017224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17224 2212 bytes
SHA-256: 4a54efc4c4bc0ac5be453f789cf51961f786c00a5c5c6eaeafa9a721bec0bb5e
font_03_sfnt_off00017bfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00019412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19412 11324 bytes
SHA-256: 19520d68afd880e435d4b106b1bbec8a92c3e761280d9772899c2e7571eb69fb

Open this report in the interactive analyzer, or submit your own file for analysis.