Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07b7718dd9eede9…

MALICIOUS

PDF

84.7 KB Created: 2021-09-11 17:22:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f23f99970a4138159d5fd23a5a6de27 SHA-1: 29675f3914741e810f9941d898dbc3b7ab720caa SHA-256: f07b7718dd9eede9788998fc1fecde0c65ed28e17b5568db7573c784508ef07c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the attack pattern of leveraging low-reputation hosting for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=aplicativo+para+capturar+a+tela+do+android PDF link annotation
    • http://hyundaidongdo3s.com/images/files/86503705806.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/53855312848.pdfIn PDF document text
    • https://isleo.com/i_photos/file/13426641710.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/gijuxu.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/73491855899.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/22997746541.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613726dd4f43e---zanazudurusotilexizof.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/74971668778.pdfIn PDF document text
    • http://c-amc.com/upload/files/vojusogul.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/xeguwosekuvitefenavoj.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/18707339966.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/bozisaxunisejunebofubi.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/robuzajafeb.pdfIn PDF document text
    • http://industrialsupplies.pk/userfiles/files/kulalefisewamex.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/banuzenoxoderafukimemo.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d4de9bd0---72655199055.pdfIn PDF document text
    • http://limoride.net/gallery/file/dixig.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/malanugozajorizoleg.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/51650991961.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16136cdde450e8---nipugepel.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ea7daf7e32cae0e56652d11e1ea1bb14/99209469820.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/34265163092.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hutg8ingindfoohqpitqsq67d0/sukuvapupezowupatotole.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/92402910476.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_off0000e1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CA 20064 bytes
SHA-256: c4b1ce1eac3bb8170052b8a3b3b1d691ff8839febcaa1698aad707eb3a22a414
font_01_sfnt_off00011367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11367 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7E 10488 bytes
SHA-256: 34d52aab4d703e5a3d6ff08df8f68a6539aca087fcec36dba3670b9c3fcb37f6

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