Malicious PDF — malware analysis report

Static analysis result for SHA-256 d519304c505ef87f…

MALICIOUS

PDF

87.0 KB Created: 2021-08-07 16:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc04209c1e6bd0b32b4b4ed340d69275 SHA-1: df94af05fe5f1223bf84b28bbf017f8fb6f9f254 SHA-256: d519304c505ef87f613f967b66c9952951c678e0dabce91f5fb2fbd44e8aa1ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://principesgs.com/userfiles/file/88439489438.pdf In PDF document text
    • https://xn--interpeas-r6a.es/upload/files/23955777092.pdfIn PDF document text
    • http://mega.kz/media/upload/files/tujuwumunebukaledir.pdfIn PDF document text
    • http://poorclarescork.ie/images/12465954162.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/191915566196.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16070188ded956---pufisunesejuguworotina.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/bewivomabemuwewusi.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/jifaxinetaz.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/gugigiwaga.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/vamunulutolaxowakubixug.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/65f10f37041a125a3030ad7de755e169/gebulilekapot.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/56578460027.pdfIn PDF document text
    • http://myjacksonfamilyreunion.com/clients/e/e2/e2167ce47089e9b789d53270b7cccc99/File/kasemujawegisosoxufelorad.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/04f7ad9ee67147923f7de76ccc7b687b/xiterolokuruxegu.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/38699616887.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/pokujoba.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777a289ed09---balare.pdfIn PDF document text
    • https://aashianarealty.com/file/gagonuguxuzawekegojufob.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/lanoba.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/xidivanisaza.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e64b31d4e76---sudizefaganapotam.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b4f92cc0---7212795446.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/fk4uhhvte9vtj9epqtj448e87n/93214092755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+turn+on+keyboard+lights+omen+laptopPDF 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_off0000ef7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 17192 bytes
SHA-256: e17d313058de36f0e879fa3cace500013a063cb95427a9250179c5b67e571fe5
font_02_sfnt_off0001349d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349D 11364 bytes
SHA-256: fe16ecf0bffa2fecea1901d935414b2154e07f68ac9207f4af5a29cfa892f015

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