Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ea0e97c61cb680…

MALICIOUS

PDF

93.1 KB Created: 2021-06-26 07:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb7be14e90f9a6f43e95338a97ba9779 SHA-1: e42923a5bad7625cd126cf5b0ce7da2d2761d4b0 SHA-256: 23ea0e97c61cb6807b1da8dc0f5c877759ec6b9beae2c47ac04250a88952aa59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms hosted on compromised WordPress sites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://garglob.ru/uplcv?utm_term=brunette+with+blue+highlights
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed74d301c4---xakugenamudigozeb.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa63a7792e1---zexowozubipanimi.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/g3pdg4656cl3lhv9dgg35bre7g/repomatovazujowesenimeti.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609948dc22a52---fujinadutubusigiken.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ad9672e202771684bcda4d99ab1894a5/13632371249.pdf
    • https://tkquiz.com/userfiles/file/97631328500.pdf
    • http://mai-colle.jp/userfiles/file/43927995828.pdf
    • http://aihyang.com/userfiles/file/zugegaxetupodukemizi.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a89abd28d2c---rinitiwumekibeluwepakerus.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a717d5d85---3694684936.pdf
    • https://mk-sito.it/uploads/file/65014930526.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d708753ec---zaduvujosimenimiginumonog.pdf
    • https://bandai-k.com/userfiles/file/rijosokogenuwudikasulek.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d40dcc707---vojubibelibovawo.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab8e864a8---dukuwoku.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/i9a6tle6o6cgubupfit7ks6i5l/44646211730.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e9df357e0dccdc7ab4fc3c6916013a7c/kipiwodo.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/056339003f6fd7f645da125f69595a4f/74396827867.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f530e46e27---78240455543.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/3b983340abdc7666b875dae2bafe342a/ruvutemebufa.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8b4b97cd---43123405416.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ca777126d---44985911332.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eba5a1971---vukavidatovifivirowutage.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_off00010aa0.bin
1ed89731e1e0340cb36227db5ef34985d4b16e59b6619aceb14513aa8b4f9c43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA0 17132 bytes
font_01_sfnt_off00013768.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13768 16792 bytes
font_02_sfnt_off00014f7f.bin
70f7dea54507d89c32764bb5487bedc464f5addc9c7945d4a810be3f6f29a568		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7F 10484 bytes

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