Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b83f7f4d49fa548…

MALICIOUS

PDF

132.5 KB Created: 2021-08-10 02:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 303e39fbc8040e6e85f89e6fc57e3d1e SHA-1: 72a93a6e550e3ab2cff9d9e733285994e2924b0a SHA-256: 8b83f7f4d49fa548afc497ab472dd7f6593e8b691b61ac8425b0064b2fe55efc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The numerous embedded URLs, many pointing to compromised WordPress uploads or disposable hosting, suggest a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URI firings strongly suggest it's part of a phishing or malware distribution campaign, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://garglob.ru/uplcv?utm_term=farmacopeia+portuguesa+9+online PDF link annotation
    • http://msamerica.net/clients/873634/File/62128404267.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/12413356328.pdfIn PDF document text
    • https://ancoraeducacion.com/images/98322761552.pdfIn PDF document text
    • https://bselink.com/userfiles/file/mokawasowomikuvekigirazi.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/19680631196.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c2fa4ee72f73ee006e74a145e6d60ef0/mopudaluluwomupovozal.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/9d9829daf7b83ef64934ff1efe3b65e7/vuralovukotule.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/1c7e01ac5dad53c3d581ab9bba1873d2/vuwepepozalalimenanetodos.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/96551517011f1a0a1dcc920e579693e3/nutavekajiwaj.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/pajojidenijonumoxis.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/0506da5e6d6960b759c8c8e8ee4ad370/fukiguwexuzagifozitizimi.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/44460bd736a1ec9700e724ee2b7a6b10/wutexozeduz.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/65411060269.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106ebcfbdb2a---62001159595.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/88539506012.pdfIn PDF document text
    • http://goref.ru/files/file/wosoxelabujajudeg.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8747f4c090---46064502336.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a141a455bc4---vegafuponaxomejitefok.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/mvg1cc2frgmofoj0mfdeqtpolsschedd/25786054283.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161045bbed518c---zadodepefalogisese.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7321235e4---13706129001.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/xenajedufajojurebiridu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/4173005817.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_off0001982d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1982D 23364 bytes
SHA-256: 38b276496b2500366bdfd2b381e5401b18809a2ce1bd83a2d5694b2b08cb5401
font_01_sfnt_off0001d267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA7E 10964 bytes
SHA-256: 1837b75c05c746549fa2b1fd92dfceb8c9b3f07936eabcace3b1f12f8db0b9f2

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