Malicious PDF — malware analysis report

Static analysis result for SHA-256 61248b8ca713bbd3…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 00:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb7fff03a4dee9b87622953957766d31 SHA-1: 4bcccf8677ba8c033652f9b680175cf558bdf5f7 SHA-256: 61248b8ca713bbd3ade00945cbe365b5a1264627634b6e2bd4c9e9ea4329bcfe
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The PDF contains numerous embedded URLs, many of which are hosted on compromised or potentially disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://universalgroupautos.com/files/others/79102210633.pdf In PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098baca1c0ad---24918896540.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/poxumu.pdfIn PDF document text
    • https://sce.tw/uploads/files/60e217c3ae3cb.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad23321618c---momubukiganebunepen.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/xozoza.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d933dbcfc---mibomumazelakuzipegevubi.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/17393492431.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zesedotuzuwinipibe.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///tozamuga.pdfIn PDF document text
    • https://maintogelonline2.org/contents//files/vikuzebupataf.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210819014603.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b90fcc545f7---buwegafezovigakib.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/nofuzugabokewevulekek.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/notajezisagudelivutas.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104ab9811f24---tekuzezupikanurab.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-18/20210518154308635052.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/oosoguhojb634m405hgq7k5li4/89977329718.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/9f7015ec558249075775230cfe71272b/fisoluxigakikisenajelafuw.pdfIn PDF document text
    • http://teplospectr.ru/images/files/tuxir.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210712_ABCE1CC370AF6DAA.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/90113565603.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedaae1ac1---kulugewovan.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa2c46356f---zujigawewajifunosadunes.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16080b489370e3---musasumuzeromiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=manual+maquina+de+costura+singer+15cPDF 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_off0000cb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB62 18976 bytes
SHA-256: 0af80ad010af6186bfd5fc3b3a036c05d89d4b3c736adc89b6b5cd4695c16e84
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 11140 bytes
SHA-256: 56f556025d4f0f6c435e5b3a12d89841188a7932184fa61dbff3e3acd802a930
font_02_sfnt_off00011756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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