Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b8191b9eef256e…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 00:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 645c0c3da46db1ec00691f4e1d4d0ae6 SHA-1: d36e6932a4deb9362f09757c7b3607193c4a0af8 SHA-256: d9b8191b9eef256e79ac7fb36bc3d57367c1e3f9b1cc24bbd640d93aa22e9dcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment.

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://navigator-nsk.ru/userfiles/file/mefogosaxegu.pdf In PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c4abb9aeb---zalozekasatozitogibuke.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/47906639412.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/23607054935.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/pudefil.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/f940b797495c91bfab413e99845f1361/67396486604.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/wirilekuxuxiz.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/nomadomiw.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/limamabigesiverawaz.pdfIn PDF document text
    • http://alde-pace.org/ckfinder/userfiles/files/8204414958.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/ligababawebirij.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/gapupalovamipikowes.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/nexomapedifirivosinoverib.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/maxatixixotewuleri.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/92271469734.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/wunuvokewebosejelukazo.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/11569681104.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3f5aa40b---lazusoxodiluwokuzafajejov.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/93451386116.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/44600012165.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/72000100003.pdfIn PDF document text
    • http://gsnursing.in/ckeditor/ckfinder/userfiles/files/97003007296.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/gukebobimirusamorodedavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=my+phone+play+store+is+not+workingPDF 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_off0000d6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F3 10816 bytes
SHA-256: fb2cd822069a88c61e2ca329372892647d35ad6909f4fd35ec12e564aa74c024
font_01_sfnt_off0000eff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF0 17956 bytes
SHA-256: bb89402e3e095b1852bf72730066ccab08d42cba71210f1dd55fc3a2cbd73fbe
font_02_sfnt_off00011e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1