Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ed9c75e991cd55…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 11:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b8a2d26a5a70b7fc254e677bb7c56f3f SHA-1: bab190493a3f3430acaa47288fee2e7dc1871cb9 SHA-256: 90ed9c75e991cd55fd9b733faef74ab92a9568c070c7e92d658c7311553fd267
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics points towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=viber+for+android+app+download PDF link annotation
    • http://iberia-ex.com/images/blog/file/21314057457.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/66887608836.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/besudujufusexorezusunusan.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0ac3bf3dbceb4922669c2b4e7ecd26e8/56681477434.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/890293380.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/vamilageguneruxikukojob.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/kanedokefanimeme.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/18059282998.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/53965175320.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/tivadipuwifokurewez.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/6413363683.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/58705366868.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/58232579186.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/41823277275.pdfIn PDF document text
    • https://adikkedua.com/contents/files/jedek.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/36151686792.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/ffb5rn0p1jegkrdh3s2li7neu6/76587739850.pdfIn PDF document text
    • http://centronegozi.com/public/zugoxubifamafatevavufa.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/xurapularevemedixupivonir.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc21628974---6772348255.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ed061dba9---vazumaxefigojagopux.pdfIn PDF document text
    • http://terrietanaka.com/library/files/27686520299.pdfIn PDF document text
    • http://akademibt.com/resimler/files/suvupukudovoxol.pdfIn PDF document text
    • http://glttek.com/userfiles/file/73753280919.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/vatumesofamikasonisodimu.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_off0000b210.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB210 17068 bytes
SHA-256: 0880eb6b9e80f980f16f63b36185cc63b13ad5d8b21d5986942a81f206da415c
font_01_sfnt_off0000dd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD54 10420 bytes
SHA-256: 8b7168b54dc2966db68208e19c63efffb736693109572e04a1c5f77d664ba7fc
font_02_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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