Malicious PDF — malware analysis report

Static analysis result for SHA-256 a812260b592353fa…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 03:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 1a2a1eaede7151979506223d349699e0 SHA-1: 8e0bb3819c83697967822c5471fd8ca32993c438 SHA-256: a812260b592353fa4c6a2bffae0ffa8971ca52730f010c11526ee1806ef646e3
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 0.9990

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://noticky.net/akce/fotky/file/penodolesibuwoluvusi.pdf In PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/67053628786.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b754d2af004---lavazadoja.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/mofuja.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/9064783018.pdfIn PDF document text
    • https://inifd.london/uploads/file/12951220971.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/2550205118.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/turirijup.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/92197101258.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/tixokesuguni.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e4b694fc---81135878120.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/bufapinowamo.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/21573839509.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/wonanelutuv.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a64fc6acf45---subelepasobe.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/0k7rstdjfuqj9a1djjdaaaeven/zarerazirazulujimiwewovo.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/tadotulebidelof.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800b8a466f0---xuvafutoposixupapixepira.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9188deea---muxixaredewazeta.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///fufoxepexine.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/zevodakelitupefavovotarif.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a3e58a45---22271343121.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/lovipoweputeriguwezij.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef68de3408---worutofaxuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=bank+name+change+request+letter+samplePDF 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_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 11000 bytes
SHA-256: 66bc5d59a338db0e4f5a13637985e429c3d5a2dd7b07d2c62f8b865ec40fb1ad
font_01_sfnt_off0000e469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE469 18492 bytes
SHA-256: 57f823e93c2a58b71e97fd09f62de6e6ac873def133c96933df6415e3a4eee64
font_02_sfnt_off000114fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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