Malicious PDF — malware analysis report

Static analysis result for SHA-256 70dbeae5951a19a4…

MALICIOUS

PDF

150.6 KB Created: 2021-08-12 17:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c3a3abed9763366a62d611d560121ffe SHA-1: 8039b36e692a012f1b76fcd672d8a06d9acc82a5 SHA-256: 70dbeae5951a19a45653ce44f92162c269e77153aba806de1526e976db161bef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://chcial.ru/uplcv?utm_term=libro+de+ciencias+naturales+de+cuarto+grado+de+primaria+resuelto+2019 PDF link annotation
    • https://hazeloyun.com/calisma2/files/uploads/nepilemowadovivepi.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e870e477f---68331137336.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/52127717272.pdfIn PDF document text
    • http://moawin.org/editorfiles/userfiles/files/ditofexegirogekosonoxe.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/88871253899.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/da90248710e151a6104af9806f8f7ef7/33057290198.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/11008024000.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a13d9b08---masefefomunarexifisu.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/6t2bls9jdffmvtorkpppspr57m/34978695162.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/70735547211.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d28e96e986---widex.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/68529eebe9a1ecd536035307edd3fb43/gisebenitesorepatuwodi.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073027c2001d---bugigewenisexemowefixo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c7e7af7e4dfa3807b835c0ec08489e62/retuderedozobek.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/61718595085.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7eae8f0fb---2812063793.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16103ef34793d2---rusukugoxotarokuvawuta.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/11130833632.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098d9fe13f6e---fobivoj.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/vifavivewegakoji.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a3811e499---20804316209.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f95d6cbedbb---23850722945.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/57851d9d588d4ee80e85c6eb94bf3d54/3863961489.pdfIn PDF document text
    • https://inncredel.com/uploads/kobevafekusi.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_off0001e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E426 19484 bytes
SHA-256: a47162f3a7386ec4ed908830569b55c74a812e6efb3be7731dcf2de4f42d31cb
font_01_sfnt_off000215a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x215A3 11516 bytes
SHA-256: 4769c2a24479a88fa281d567b6f6ace5588e1bf399c9fcc3332cc1a179b6dd19
font_02_sfnt_off00023088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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