Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c5297a104a0b4b…

MALICIOUS

PDF

87.5 KB Created: 2021-08-15 06:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8498c11aedeabea3e2e5e0f49dfe1334 SHA-1: 7298d1a3c34fa9c5e9762057c3deaf9146753a53 SHA-256: f0c5297a104a0b4b62265435bc44d8cfad942832aa0f612a2800d88074d522f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm that redirects to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URLs suggest an attempt to lure users to external sites.

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 http://51www.org/uploadfile/file/58865ffbf9f682cfb3d82d8e66ca9d13.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bedf29ba24---76177450107.pdfIn PDF document text
    • https://all-new-wow.com/upload/files/vokumimatutalubevurunela.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/16047879571.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4866ddbe---86969705016.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/30978591994.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/77809916037.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65cae53dc8---tepagididunuveruwimig.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/5a6488aeb6262626c59c68dc8cdc21f6/988939665.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/vanabemataxidefogitov.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2276a05092---24076354286.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/nebomowepusilolerokidi.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/lerenaj.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/golitadukajemukigufofik.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/37372892687.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/70a556865f367b1009a8ae18ce9d3549/limajelevelubasufuf.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/83174149637.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16072ab609360a---pukevevisuwetepiwi.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/85230840946.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/41518221660.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/64946376438.pdfIn PDF document text
    • http://ebrinteractive.com/userfiles/file/rakumupumozukimexirivor.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/794c031f2f38b3192a070ef2fa7da49c/raxosamoborexe.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fd6e02872ef9f78b28b8c8b8e34d66e7/91410439639.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=descargar+tonos+para+whatsapp+cortosPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 16944 bytes
SHA-256: ef0329dac4803480f2d6f4d9e9c4ba3aed2817dbf0857a17f9b8becfccd91a33
font_01_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 17832 bytes
SHA-256: 26bf03aa721329e5d310abe164ae6f1e5723d2ad496550e283af5b45f507ddaf
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 10600 bytes
SHA-256: 9765f6f7912fbf0ae4c0507efccdaa822183fbb1715ba1391bb51db6164f21ae
font_03_sfnt_off000136fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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