Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d470ddbfea610a2…

MALICIOUS

PDF

92.9 KB Created: 2021-08-06 16:45:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 961bf1b8bccd6ac820804f4bab5b3005 SHA-1: 8dde51089fb3146f5818978bb6a9a5445aaf6ea7 SHA-256: 5d470ddbfea610a244148b857e68c8c85c76675b746052ec1aa508681b3b8289
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and the structure of the PDF suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=diferen%C3%A7a+da+parede+celular+de+bacterias+gram+positivas+e+negativas PDF link annotation
    • http://nsdadventist.org/FCKData/file/23658067913.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c343fb3372c044bda9d574b2a6bbd73a/56797238070.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608002425121f---84269051403.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/9m2bs37v48fvrkl941iv8cquej/rupawotixolak.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/wufubuwufurudi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f447c3074001771dc0b037d8dd0207ba/sojodedo.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/90602157253.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db2bb98da6---dejekilexodotoru.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5e4n941etj73nnumupup7tpm4d/rotujepuzuj.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f079aa08---fumatig.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/59759741307.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/niwigukulupavapuxarovut.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/39365255378.pdfIn PDF document text
    • https://oklasik.com/ckfinder/userfiles/files/84613742828.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/lixitovadijejadagavifij.pdfIn PDF document text
    • https://albawadiroad.com/userfiles/files/fenijipapezamigo.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/18038035475.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/zifazibopovalara.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/fotakosidagukepuf.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/opei4a1cqtmdeqi135v9v770sk/40146767776.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1al29ekqene3dju71p64h3qcfe/rixelaroridumaralo.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/wekuselinid.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876fe7df771---4311759216.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/0729f89a3b679ce3f097de22dc90353f/pilurojune.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_off0000fdf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF0 11468 bytes
SHA-256: fa217e1e344fab6b2813feefa6a4ac34c0511d3d08a58edcd925c5338e159918
font_01_sfnt_off00011855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11855 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 19724 bytes
SHA-256: 18a17027009cda316bd3efc661e7a5d20c424d81aa35ccbfd7f350f1f69306e7

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