Malicious PDF — malware analysis report

Static analysis result for SHA-256 d339958442e80f6c…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 19:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c5822f5f04bfb1951dc32b18a9ef1a6 SHA-1: f1e685c1efbc74f92496e4a00edb93cbb63f050e SHA-256: d339958442e80f6cb8223107270d1f6e16ffd211d1abb7e4950c0e3178fdb009
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely used to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=los+dones+del+espiritu+santo+pdf PDF link annotation
    • http://www.cpiequipos.com/assets/images/user_files/files/56458115172.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95aee6edf---56305260131.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/najonurusapuvenumikokos.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d03bf709---kisorokesugo.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/56206163651.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363398148c9---labasifutuzo.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/wevevirabujaz.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/fepimopelij.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/63158679865.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/3ad8e0170d0a3829a36d31deff5e94d1/romabonazawujaxisi.pdfIn PDF document text
    • https://kuepancong.com/contents/files/81612487572.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/nomomanozosuludiz.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/kewupaladoxoxukenav.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca198e3570---61900329890.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/161303bec7d25f---44448437417.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/96d867378925489a7b687bb6203365b9/2440417941.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/lesedatavubikidavaf.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/muzewefujila.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/1160090555.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/me64369o7mmpln67v4agff1gf5/69941714368.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/43945724281.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/mawolukexetutorirotefo.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/27584340845.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/45787767291.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_off0000be71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE71 18056 bytes
SHA-256: 3cbfb8207dd24ce3bf6af1a1ab42a769454f8e24e2d76877de672e8597df15a0
font_01_sfnt_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001040a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 10548 bytes
SHA-256: 36321ab73f9152948415f21bc27dffbacec385a62b73765c86b72dda49e3c3bd

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