Malicious PDF — malware analysis report

Static analysis result for SHA-256 4980ef95aaafb224…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 09:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 938b741f5974acbdd387a95d30d261b6 SHA-1: fee66f81d57b7e2b871310f7b032dd0288780bea SHA-256: 4980ef95aaafb224dbe61f95c0838f339574c976ba665a5e0a4c17639f123232
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file contains numerous links pointing to compromised or disposable domains, suggesting a link farm designed to redirect users to phishing sites. The presence of 'utm_term' in one URL indicates a potential SEO-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://ketchas.ru/uplcv?utm_term=best+pdf+scanner+app+for+ipad
    • http://olynskiconstruction.com/pics/file/87424741986.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/707044f215f45cd05af8a57a28f60f5a/vijizerajob.pdf
    • http://asianmosaicnyc.com/userfiles/file/29726781616.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/2knh5dp59a667e5291e3ri69g6/60627408941.pdf
    • http://escrima-rlp.de/userfiles/file/48868846156.pdf
    • http://aliceinformaticasrl.com/user/pages/rawarezibogozazasen.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/3cj4qoakelnonbq4icob6dun8l/pidebikemudorageb.pdf
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/31378779502.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bd14cbd2---pawidif.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05417d8d12---68784169509.pdf
    • http://dralituncer.com/userfiles/file/xonojivo.pdf
    • http://king-ber.com/UploadFiles/file/20210808191246428.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1d661e51---9090231956.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607772ee824d7---17020496603.pdf
    • https://foundryindia.org/userfiles/file/76546334187.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a67577be---43760707354.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836197ab174---6632708349.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/811c9910cab647d330478120cc5d56d3/51137172557.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2e618960f---81198858909.pdf
    • http://zkojicin.cz/userfiles/file/setixeravipowagut.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/gq92u8nrolh2c9tpb4k1okgsj8/16419705309.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/roxariwaxesu.pdf
    • http://dekogard.net/deko/veri/_files/fitozesuxaluwu.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089aa8285422---71807079089.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/viwogaf.pdf
    • http://studiogalata.it/userfiles/files/95737343573.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b94f.bin
1d6846349e22934d614c2b712412e5f2b6a50fffdd998032841c82c8ab19d7cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xB94F 18244 bytes
font_01_sfnt_off0000e59b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 16792 bytes
font_02_sfnt_off0000fdb2.bin
868bda6c160a451b207981cde7e33fc89bdeafb09a639f2ff51217de84b51c45
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB2 10620 bytes