Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f242ca6a9482bd…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 15:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aef8f80796ef454dfb7715665d5f00ef SHA-1: 66cba9f8479d116a179efc6ce19a196a0ee6dc76 SHA-256: 61f242ca6a9482bd367216d60fb619f7a8bd6df9c8b846728d4de3e237ea618a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are identified as link farms or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pistant.ru/uplcv?utm_term=how+to+give+root+permission+to+app PDF link annotation
    • https://hkki.org/userfiles/files/sajijosimoduzagikiloma.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/6b5426ee2b051b3b34d70ed2767d362e/41248354143.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/75027201777.pdfIn PDF document text
    • http://art-ball.net/files/file/lubasemimafifoji.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/vasudedifavolozaxebi.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/pawemuzo.pdfIn PDF document text
    • https://intersat.lv/files/file/41602911228.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/23789310158.pdfIn PDF document text
    • http://hiniceshine.com/upload/fofak.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/vomagenagufilewo.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/pamojuzusimisafiresele.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/gavukiwi.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/jegiwipujezejexududajuda.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/bunijaxuzimobejoje.pdfIn PDF document text
    • http://edallyshop.com/upload/files/xigalikewoxamilarujejelun.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/tejazidotifolemik.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613376331c2aa---tunirejulagaje.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/nedameb.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/76979529006.pdfIn PDF document text
    • https://phuquiland.com/upload/files/dodowemixanewafedine.pdfIn PDF document text
    • http://evohome.pl/userfiles/file/52390884334.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/522709998.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f64510c0a3---28284038699.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/dokelaposaj.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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 19044 bytes
SHA-256: e34ebad7a029be11a704afc7c6eaf4229ef110ce27cfe3188354b166d022df76
font_02_sfnt_off000127ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127EE 10692 bytes
SHA-256: fd376851f3a45622543d5070bab414bcb9cfa4739e651e4f1060562e4544a1ab

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