Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad98d655a83e1875…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 03:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4e7787728100d0473cc50b3a6117e86f SHA-1: a45f34b26265c34c3b4f8e584786330ed20a65f2 SHA-256: ad98d655a83e1875409a0176391481c833cb2511bdd9ad183e0a0c89fa5b7bcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://pixomot.ru/uplcv?utm_term=sanskrit+thought+with+meaning+in+marathi+pdf PDF link annotation
    • http://folientastaturen.pl/_data/file/84240473679.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/e7c7fdd2acd1cb1d7797c6159634a5a7/4743460126.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/nejuvizetewoxususebateri.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/nabuf.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/s5lov3cm38l7o0dmslfcm55ro7/gawowamumisabujedu.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d65435ac3a7---55661997179.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29ad507b15---16551194972.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/44115260654.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/21404218146.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a160d11a---sedebimoxezarelapibo.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/woxugotowajakir.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/57379253650.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/0aa2aaffb51ff944324c0a3ce7bceb24/genenoraz.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/15170561205.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/90543954363.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/11206274360.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/47082843046.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/fadozevajuzerowoputame.pdfIn PDF document text
    • https://hiroyoung.com/data/files/xikibugefezegasazuru.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/f27aa439415ea4e17f439ab6a8407753/202062715.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b73b1d7f9---11341671012.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087981d9bd58---47441540932.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16260987374392.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/vodewires.pdfIn PDF document text
    • https://congchung7.com/upload/file/49382314694.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 22216 bytes
SHA-256: 2e5706ec08c3e23d40f1c21021091da678747c2cefbe77fde6166fd9f31b8f9f
font_01_sfnt_off00010e8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E8E 11252 bytes
SHA-256: 86cc7f7687642f8ae1bdeccd42bb178aaed98f761fdfd7fdbd7c01ccc7a7d31a
font_02_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 2016 bytes
SHA-256: c603dcba9f64fa4efb662abbc55aa3ef223addb97cf868c5e2067cb26bd52d9f
font_03_sfnt_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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