Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9eba87c88d0f6f7…

MALICIOUS

PDF

72.1 KB Created: 2021-09-24 08:35:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2e9001d5d6192eb33af3f99eca0f6e62 SHA-1: eaff3114044758231b438df8492c943349a7b1e9 SHA-256: d9eba87c88d0f6f7339171ea3c282da3669034dec50e12558e4c8edee3ea3bb2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://marljivo.hr/UserFiles/files/44186285834.pdf In PDF document text
    • http://quaint-house.com/images/blog/file/99282214302.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f093faa2ac---67041888828.pdfIn PDF document text
    • https://hssanesteban.cl/files/mejebagijutofirezavididel.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/wipagibezunodaruxifexuv.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/dolek.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/19361175131.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/91248421521.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/12843612654.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/a87f1e4e9474f7378eb73060fc362871/weziba.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/zaromipapi.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/58622538721.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/74078121200.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be3cd44ead---fuwogofabubelawudutoko.pdfIn PDF document text
    • https://thietbigas.net/media/files/59673995487.pdfIn PDF document text
    • http://quranday.org/userfiles/file/82228788352.pdfIn PDF document text
    • http://aminotp.com/upload/files/81173321174.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/14962749157.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/16144800371.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210920111536.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/3691235974.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/34731758073.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad2d9ee788---96147306077.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/52632448410.pdfIn PDF document text
    • http://mgrima.com/files/file/79692162590.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=sher+e+punjab+money+exchangePDF link annotation
    • 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_off0000ba77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 15540 bytes
SHA-256: 06de2b674ae868e11d357f6b7807b0fcb2dec8c18974796215c4413f508e382d
font_02_sfnt_off0000f988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF988 11080 bytes
SHA-256: c7e8ae3f8d1ecf79dd7bb126a2675f76ed19460ecfc19f0fc32a31dc4f508397

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