Malicious PDF — malware analysis report

Static analysis result for SHA-256 a64558308d77da61…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 10:30:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7ed4bb270babd30631a6fec10641acb SHA-1: 3ff137870c377aaea5291d999e00e23ec70476a7 SHA-256: a64558308d77da61face1ead785f3ef8b29c422cb4653e6ac7a8d847f9d0f56a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on compromised WordPress sites or disposable domains, indicates a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=critical+thinking+and+problem+solving+skills+for+students+pdf PDF link annotation
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1934c47a9---xanegorejakax.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/17795884025.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/46678748790.pdfIn PDF document text
    • https://akvaguru.hu/user/file/17150101253.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a8b57c70489146adc331014d5450b1c9/22328179780.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/nubanetuzedobirifexo.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/zizotatizakoluwobojo.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/54343624772.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/3239638a602cb1ec892ad5335216984b/20496991095.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/60289730933.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/13n54tj8mjgmuq6lr9amkliql2/59448093390.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/39426937501.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/nakuxonomeriviv.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/c4232e7b2ee83ab96dd5925fe5a2a9d0/60081022383.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6301c2daa---gemaxinesi.pdfIn PDF document text
    • http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/50176340722.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/11c89a85f0026f310c31ccbf4ce1b708/2951714095.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/n5rl068leqriffdu13ic54dfb1/busojosat.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3bd5e62ef1---koxasolexisuzekibuji.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210716003031206.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/wodowomuvakewofobodux.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210829_164521.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/32830714194.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/2e35851ce55e4ee2c94f12fefffb45b2/57462187258.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_off0000dde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE8 18116 bytes
SHA-256: 4eb15ee0db4549a43dd098c0c9d90c6768d94c654d21474d55e24cd0131441db
font_01_sfnt_off00010cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD4 11496 bytes
SHA-256: b7980682cd53b4f391a134de827d3705c14bfa4434b4fb92417cb68b1804eec2
font_02_sfnt_off00012776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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