Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9535d5911b0ae61…

MALICIOUS

PDF

94.1 KB Created: 2021-09-01 06:03:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 85df60e579359da95f180f859ca4204c SHA-1: f3a2608b69c403054391be215cd517a5772899b3 SHA-256: f9535d5911b0ae616a2aa93fd618a493bf7058a0196a8f0b95a3e471f7db353c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=sudden+inflammation+in+body PDF link annotation
    • http://forter.vn/hinhanh/file/puwalexotab.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cad86166b29---21688823549.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161044ab5925e1---pikemufov.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607486e2ee55a---46733458877.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092beabb5c27---79095916253.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/23860236988.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aa7d92ec4---ximinexexamera.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f305751f6d3---67038899297.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/46851912406.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/38869920449.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/jakalozafonifumodagolef.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/ec887ff5cd5c845b95f593117ac72400/dumixenizoludiw.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd84bc03a75---gedenatineb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d37a45518---kuvutororab.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/46110574073.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/lonaranamixotilejelopi.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/gabejegukavowi.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608947c976c5f---13866986278.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/6718980612.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/d31304f1b923ded81f4e74b04f3f9a42/38735903932.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161067b049508a---16136081671.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767feccb096---fuxopuwunilurutagom.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/gv1ies8d6kje0tuunce4qiup4d/xapafizirikemaj.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/fiseliwizaxodi.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_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001201e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201E 19204 bytes
SHA-256: 7296080a83a556963ba903362c583c81a3efd84aeb119ddaf62d2ebcdc304f2e
font_02_sfnt_off000150e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150E9 10676 bytes
SHA-256: b6dcc06de10486c80fbef6eab29999236014091e7d4b5a29772872ebce3a7459

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