Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced86e5fe1ea7b51…

MALICIOUS

PDF

90.7 KB Created: 2021-07-02 10:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fa88f5a5e149c94a2d2bb216f5ee814d SHA-1: a747252e3387817ef79e6ce73be7c1d8766611ba SHA-256: ced86e5fe1ea7b516c9b67dc708bba06ccb942afa0eabcb4ee429f39a084ed36
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver a secondary payload. The presence of external URIs and link farms points towards a phishing or redirection attack.

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 http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16070638c4d8d6---wuzusanigudeda.pdf In PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/uls76japmi8t3fagvu1batjam4/26704928470.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/48bf0e0acf7f586d0c9fece12f5f77c0/kofukajenom.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c46fa877e---61535479977.pdfIn PDF document text
    • http://goref.ru/files/file/xixemozaredaw.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3449fc8183e4779376148a6abe5f4407/36060407835.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f602daf4---61854281448.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/8f81b57176bbf65a260f2a857aae6020/bibepopugaruzodusadipek.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/88425053131.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a853f3bc758---56171922380.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adc39714b1f---22335904260.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/70v12c2sieon4qump00flopeq0/butugixopanegekob.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/tvan4ra3g2926vfli85ugeq5qk/56189978127.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/b3c3b087b8b96289549993f3be42fa13/35465505971.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/93905289159.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/f311jl38d8qmlff986c7if7as0/vitugoza.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/jatugokagizajadabodal.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/gigaxazubikilof.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/34932039595.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/cf8059e505c118671458dcfa95de658b/lapak.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2f6e2768d---neluvudelizuxejob.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/jutises.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87c83ac67---68799760208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=french+a1+vocabulary+pdfPDF 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_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 19456 bytes
SHA-256: 6dd4563110874443e4e990601175965e712f0fd0ce6075202d706afc1d55d4e0
font_01_sfnt_off00012bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143CC 10808 bytes
SHA-256: f0a719b20a83c129aa4caa1e12faaa86884aec2f78137677096c5f15cef0c4cb

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