Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3ba27c6ef9100e…

MALICIOUS

PDF

79.2 KB Created: 2021-09-30 18:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a15f40a3bbbf992591fed47f4da1ffce SHA-1: 5240bcd522b1c6a3eb6c3420974ddd7cfbb9e127 SHA-256: 8e3ba27c6ef9100ea4108c34fd5c501c8085a2b30da0c1ba5e3889bde917e665
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics and ClamAV, indicating it's likely a phishing or malware distribution lure. It contains numerous links pointing to compromised websites, including those hosted on WordPress upload directories, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=brooklyn+nine+nine+season+2+123movies PDF link annotation
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146b6c1edf96---pelofeduworukurotoxov.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/93266939864.pdfIn PDF document text
    • http://hidropro.hu/upload/37371706317.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/vumimogaxekonu.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/73857443108.pdfIn PDF document text
    • http://cl-pub.com/files/files/vavirirogezadakipazajeloj.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/divawawajusuwajitaxarid.pdfIn PDF document text
    • http://rentaruedas.com/files/others/47566417432.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/78164528095.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/lusidus.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/wetulijorovipijagugefose.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6sf25tdg0bm23k1otfaube1j3k/wagevevumur.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/vatovijevovuwej.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/36777080268.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161426b74ec759---3529280953.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/56064060697.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/muwulojujevugonemabizujum.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/43161065474.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/59331492402.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/46011988860.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/85349018303.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/vupifupunefagaduvurasox.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/62299749392.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/44247361001.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/sumujok.pdfIn PDF document text
    • 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_off0000c4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE2 20604 bytes
SHA-256: f826003b72068f9b1e111a82a1c5dd2cb73930c11fd35fb21881b4c9c94ba7e6
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 10840 bytes
SHA-256: 7eddfbc373fef81c625c831053ed6062a11320653752e39edef5c614c3096d4d