Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e82ab0b257dcd83…

MALICIOUS

PDF

111.2 KB Created: 2021-07-31 01:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 74875d0881f24dbde8ac8403fd0eb8c9 SHA-1: ce706f26a15b25cdfd79cd806fd16bae4fe7a9c1 SHA-256: 8e82ab0b257dcd83628a2a1691898a5461088a071da246065dbda9a85e3d3220
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or utilize URL shorteners with UTM parameters, indicating a link farm designed to distribute malicious content. The file's structure and the presence of external URIs suggest it is intended to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=ejercicios+de+equilibrio+i%C3%B3nico+resueltos+pdf PDF link annotation
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c7999343dfd---bimepidibixofinuw.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f5307ef95464e5a4622b1e54a3b38954/wobogax.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kefujanavowutome.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba182912512---bomuvepalasipoxujuj.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/edc327664770ecbe411b7f676b298f55/53613442329.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/033c2962273d3918f79f79390981bdce/mikik.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/negufomuzag.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/daziguwisimasewosujiwozi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0aa8c5035---60835700792.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/79240197352.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad171703065---redojagetinirovofe.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/dec727d64c10a6ce7c6f89dcab30412d/87977124710.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/47018807658.pdfIn PDF document text
    • http://chikatere.com/Upload/files/93547143154.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609b53ddea32b---46163495578.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/54107792791.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/67207965174.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/23073934951.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/kudazipoximapofibe.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/82362246818.pdfIn PDF document text
    • https://hoavily.com/uploads/files/xobesose.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/31969833084.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/98475512255.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/bekidiwutegaxakejasapo.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/39914193863.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
stream_006_off00015be1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15BE1 21332 bytes
SHA-256: 9d7bc4108ceaa126ea15077c4731c777f9afaf6cc7bf95a12279398d1f537c1b
font_00_sfnt_off000142b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B5 11088 bytes
SHA-256: eecc77dda90df8187febe5693f8e5f80a3d7117e53b9a618011429bc18eddde3
font_02_sfnt_off00019357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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