Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e440e9c1c83f5b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-14 11:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aedc26c74fb2cb87341bd16ac810abbd SHA-1: 0f3ef5cf8449ecf074c974cc3b24ddcae5d5d723 SHA-256: b5e440e9c1c83f5bd84044e63dc97fc61edbfb3cd8aecdddb00663d6791dc464
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, some of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The primary URL, 'https://wastran.ru/uplcv?utm_term=ps4+emulator+for+android+offline+download', is presented as a download for a PS4 emulator, likely a pretext to deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=ps4+emulator+for+android+offline+download PDF link annotation
    • http://xn--j1aii.su/userfiles/file/putamivezevuzaxa.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/rizuzekefapibeloziwolib.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8a79bcb3b3a851866e45992cbc58379/30801831311.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/225687af258d535c7620fa23aaf5cacb/ritoregudevutitisase.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/62577560879.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/lakidoso.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210903/file/34303470066.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/bazoj.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/68747984643.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/rupijipalalututewujiwes.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/lunefidoruw.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/66554462828.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/sidegebutasovarenemilupa.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/97470325135.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/50065268100.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375a0639375---11204093580.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/dedozepilosexefoxoxenenu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161330914e8eab---60666035262.pdfIn PDF document text
    • http://sns.hu/_user/file/detogitukijogojelota.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/93955964703.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/10770682211.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/55844132559.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_off0000d2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EE 10780 bytes
SHA-256: b2297ce782453d2a4fbf8bf0e079b8df2fb150ff9da78859e551dad352ee9cf9
font_01_sfnt_off0000ebd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD8 17232 bytes
SHA-256: c77ccf325f70c76d7fdf3f1bcc9574557c3d5ac34051e6bd3773f6803879112a
font_02_sfnt_off00011811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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