Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a245d9de92ff7d…

MALICIOUS

PDF

71.4 KB Created: 2021-09-04 21:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f94e0cf8905b3326e79d5025763cf61e SHA-1: 5d68f1acfa68e3723a971aab375d719a56087b2e SHA-256: 57a245d9de92ff7ded9394702a2e28a73860ceeff986e85bd04c1267bbbad55b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, likely intended to redirect users to malicious websites for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the nature of the PDF and its numerous links suggest it is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://wastran.ru/uplcv?utm_term=differential+calculus+book+pdf PDF link annotation
    • http://nfrostov.ru/upload/files/faripegipunuzodusetu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/4eeadf3c087f8350821ef4c032cc2cf4/tunuzajiliri.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/lelemuganibakenetibivu.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/38505866500.pdfIn PDF document text
    • https://maymac.info/userfiles/file/terisosojodadoto.pdfIn PDF document text
    • https://willmarlakesarea2040.com/ckfinder/userfiles/files/28924903473.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/khohbnc028n97r2agi1pglpfnl/69416332652.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c571e586d---22307064079.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/72168950341.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9e7be673---jafasilabobukotajizewole.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/kafevukojovesuxebo.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e602c41582932e6f56e3fc364581c53b/46434800345.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/964165241.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8427785b9b---33653155331.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/39442546433.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/zolefeduta.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/22272318373.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/es7ae6ipsii9iv3kpgt1n77l55/namamarubigorajazo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935db384ec9---75044389635.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/duwawagapiziwewifakesumu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/pedorezo.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131afb3afab2---42981102617.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_off0000b7b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCE 10944 bytes
SHA-256: b4f1213e66bd91fa0981c6edc600d1c8031fbed14be11e87d7335f7aa47dcdf1
font_02_sfnt_off0000e916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE916 15316 bytes
SHA-256: 965dd817741195ef3ec9d5811da9321103409aad1f9a64349cd41d587738e080

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