Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cd3c083889bce3…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 08:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d641986da2bbe2f297c48fe8999c4014 SHA-1: 522602cc8c8f6a8bdc28b118e5687161848c53d9 SHA-256: f2cd3c083889bce3e8bb1e433f5e3ca57e272be053ec5f0b82e77a306f14aefb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=book+of+jasher+pdf PDF link annotation
    • https://tasleemdubai.com/userfiles/files/madiw.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/nagiduralobajomutiwan.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3af1d3ef7---8119636167.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/jadulesewetitewofaxetevo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/2f7p4o7rfkp61fn2fgqf4jl482/vorapusojaki.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/93236012679.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f0f520f0e---kujitutaso.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/57022964105.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/91006519660.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/34760981866.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/501031882df85cd1471dd23f591c1862/31714868233.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/vekitunapazifarom.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/61695350212.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/xenakawuzozizazi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/q2t7d2rg78d1mhn6s30ienk063/doropalas.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/detag.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/58935619306.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/xiputejekiwumevit.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/zukosenivenas.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210903_055933.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/90219477094.pdfIn PDF document text
    • https://luminex.pl/upload/file/zawudotisot.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/99967920901.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_off0000b340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 10532 bytes
SHA-256: 5855d2fb99a3f677cb9f4dffe511d7305cb2ecd4e611c45bef6f544d36430af5
font_02_sfnt_off0000e37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37D 16144 bytes
SHA-256: 604153fa26a552a015fddc52f6efe1040d3ae2aee20e1cf9c14c738d8148837f

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