Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3e04422d77a4ef…

MALICIOUS

PDF

70.5 KB Created: 2021-09-07 10:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 14f3bb775349dc7a037f87867700bacc SHA-1: 5d6b3cd8cf5dc8562817d245d806d1e85cbba3c4 SHA-256: bf3e04422d77a4ef2acdefadd815d5c7dc5e1dea3cc26c7f3ce2462eb3ac6f36
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or malware distribution attempt. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs suggest the primary goal is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=pdf+file+explorer PDF link annotation
    • https://consultingexpert.eu/fckeditor/userfiles/file/88152943546.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/phrum3rv4m5bkb0gef0n2uaq7p/dilezixal.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/43978356303.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082f11bcd6ab---rosemetironakobi.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/40168140390.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/tokafudoxu.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7a245223d3a2f6bca11c6317458e597f/fiwaxonumaderatureru.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/23167122609.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/054b496c3a2f5521a5443788b4e32259/tomabidawefuluv.pdfIn PDF document text
    • http://ruihuitax.com/files/file/95691660570.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/gckn43jojag5sprcu991hdrmn6/tavilonumufazifazeda.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/37688a3f3576996db6db1302040d9c5d/53772551304.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/kijaxinelojuwup.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/pudaramudabisoz.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608081ff8671f---xakiz.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b0c73e892b10a9aac0c2ba97c04f75b1/pobiweror.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/17933026980.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/porub.pdfIn PDF document text
    • https://camelcarpet.org/d/files/39868648491.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/80036192676.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_off0000b6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A7 15484 bytes
SHA-256: ae3f61b20c33ca53ce32a66de39faf5f3268e05395089efc70f42ab3e5ad2537
font_01_sfnt_off0000ddfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 10064 bytes
SHA-256: b0036ecd68729146adb2bc52d5e10d8d507db3570ac79722987771413522dc88