Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf7a655e9ba3162…

MALICIOUS

PDF

90.2 KB Created: 2021-09-08 01:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9b72aa659740f3f52d23be94075e5580 SHA-1: bec0f2508c6598baa461549d51bb88af84bcc2f1 SHA-256: 6cf7a655e9ba3162475c4e00da87a869667ca058e529e42ed7eac0f9db10dee2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a link farm designed to evade detection and lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac76a27c9---boxigozan.pdf In PDF document text
    • http://stillincontact.com/images/mails/file/51117994823.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/65151917698.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/gatudikal.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/belabu.pdfIn PDF document text
    • http://huiking.cn/uploads/file/150528097112.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202177459447090.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c799d31b2a8---tejarapifatixedak.pdfIn PDF document text
    • http://tulga.ru/editor/files/gazobudevepiwovanof.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/46454693887.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/90324625921.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fonorepukazipofakipo.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7c20f2a1c---perosebisusi.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861d3cbd94d---texurumojenividanupuz.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/75351107844.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/faruvufuwebapulifoxasovul.pdfIn PDF document text
    • http://pyroglobal.sk/app/webroot/files/userfiles/files/zarupemuxarejol.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5d7de13cf---zetodaxijesugofotesesuwek.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/9840912eb4fc12811d5a27c496c012c3/solasul.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/23476808756.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/96610998067.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/bb57771df68f0e74508957b2a409697a/gulotopegobuzevixuro.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/52402351290.pdfIn PDF document text
    • http://www.jobibon.com/admin/userfiles/file/10741543777.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/e2b5aa20dc344883d106287de65d2755/65920526715.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/belefuposew.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3f4f605a51445cc737dfa9c859feee46/32909649449.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=european+monetary+union+pdfPDF 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_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 18740 bytes
SHA-256: 905144c0a41c68ae2de32625d83dd4be2dba18557c2754830ecb229bf4401046
font_01_sfnt_off00012a81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A81 10644 bytes
SHA-256: eb0a10586a03dfd9b83612fabf218a9c245d471cdb5bfc90f2b47edcd86e6fba
font_02_sfnt_off000142d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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