Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ddb9ee99caa26f…

MALICIOUS

PDF

89.4 KB Created: 2021-08-07 05:25:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e23609773b19c815f1c56ece60c71c3f SHA-1: dba126349714b010a5b32ee48f9da50c46b213ad SHA-256: 39ddb9ee99caa26f1404b6a8e9a84690951f6174bf2d598fb3f23e4b4226c864
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised websites, likely to lure users into downloading further malware or divulging sensitive information. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608872a49c700---lanizigato.pdf In PDF document text
    • https://viscom.bg/uploads/wysiwyg/files/68961864091.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c5ca68c99---molevovegitibose.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/97482358563.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zirujor.pdfIn PDF document text
    • http://bakoca.hu/files/file/48897617319.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afad14529bf---jeguvabenipigevajido.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/55312068732.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988cdbbf412---98737122763.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/75013547971.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/am5aq9madjueok6689d75qdsm4/faxexif.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/kukowetexupazoxi.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/wimololifiku.pdfIn PDF document text
    • http://abeess.com/userfiles/file/rukilerapagisozelu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4ff4bc273540ec04ceb33975b9e8032f/43355994897.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/78368403213.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/gilazosamu.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/69657493885.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/jamugewarufofevufu.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/jojozijeretilovudob.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a54130d5e89---14455070463.pdfIn PDF document text
    • https://xistenze.com/files/files/bupogatofokurokidonok.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/vazawisevigurevelazapuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=subaru+impreza+wrx+sti+rally+for+salePDF 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_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 11092 bytes
SHA-256: a8f1f1547fc768b476091026d69f3c0c07a4c15f749872044bc1e23f46b42788
font_01_sfnt_off00011130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12942 17444 bytes
SHA-256: 4907a6694edce1f2d97ba46738b43fb632758f1bd349efb56962126a17a53ad7

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