Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc99810d2cc3a2e…

MALICIOUS

PDF

76.5 KB Created: 2021-09-08 04:14:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60fe38556535b51b63c8bdc5a3808274 SHA-1: fad534d85c7f4ad7416a1ca0542a375e85143a80 SHA-256: 8fc99810d2cc3a2e7b4bc30da6b130f5fafe70286d90fe83d6ca59a15060881c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to redirect the user to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=las+leyes+de+la+naturaleza+humana+robert+greene+pdf PDF link annotation
    • http://nextgt.eu/uploads/file/xisedutelagered.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/2608902245.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/wukenibuduwete.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/81733447690.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609426d406ca2---dedovoden.pdfIn PDF document text
    • https://people11people.gr/uploads/File/37819679885.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b24a5032---wigisudifepogo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/rdoc9ki3kh02degj4g1nnars67/zapaguxevevosusafofuwisoz.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/13955224544.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078107727621---47312287691.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8c7c447f8---20971158181.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160883abaa9a32---32697865403.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4d32e2efa---40070675509.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097ac2c82419---dulesapoto.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/dolibuvupa.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee89a7b73a---rinezolunapow.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/20561853391.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac098729928---89229241731.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/pifasopusa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15daa0b1c---bonovetobon.pdfIn PDF document text
    • https://webhosting4.net/media/file/35975107961.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/sarajizuwire.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/baganufozilawoxazuzotagaj.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/671f2806590ef30108675745213f90d8/71030214395.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_off0000c364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC364 18572 bytes
SHA-256: 4fbac3005348188f68d23e4904b7fe95f67952debfe360dcdcd1a6613d1c2868
font_01_sfnt_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 11224 bytes
SHA-256: 33a6576496d572b868bcfedf4461963d79a715f2877109e8b75ae56d763f7a19
font_02_sfnt_off00010c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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