Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2379fbe4dcd0aeb…

MALICIOUS

PDF

87.0 KB Created: 2021-07-23 09:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dcdb8d275d71d808128a0dbc03f4fcd5 SHA-1: 5437151372e902d53197ba920387e5cdca64588a SHA-256: c2379fbe4dcd0aeb0ff820593b0437bf784541519094ed53fa9fe6e1bb88aa6e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF's structure and embedded links are consistent with a phishing campaign aiming to exploit users through compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://eprdel.cz/userfiles/file/rarekewepewijofixawino.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f2339c268---jedenov.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/nkbsvvspdt38tv9g0mqommtnvc/gelaz.pdf
    • http://studiosiciliani.eu/userfiles/files/46570638197.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097c7cad5777---namaloredeboxosovu.pdf
    • http://baugeraeteverleih.de/benutzerdateien/7984432443.pdf
    • http://suachuaspa.com/upload/images-content/files/zanuxizaruzudara.pdf
    • https://bachson.net/upload/file/kafiluzopopib.pdf
    • http://singer-island-condos.com/userfiles/files/sipibivofemoxonov.pdf
    • https://pellevah.com/upload/files/86600998300.pdf
    • http://guides2alpes.fr/uploads/file/98284445301.pdf
    • https://bravo-hk.com/userfiles/file/sibigapapi.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077673f7040f---vuribemaniki.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/sb1i37g9kh0t1ciijv3uinf4ks/femepujo.pdf
    • https://srmhomes.com/images/bulk_images/files/gevifoxavagabevefarigoj.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba364afd5---pazabesunelanumus.pdf
    • http://doktor-okonski.pl/uploadimg/file/bisoxidijalomepivibefevu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2cb008433320ad3b60c18a3700325f50/xixijazapude.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517121654955386.pdf
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/zojulewu.pdf
    • https://paklya.su/design/img/upload/file/xejuse.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/c1k5odj2nc8drlgqnjb2g1khot/94747756112.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072322b30099---buboxapizuk.pdf
    • https://avgdesign.com/userfiles/file/kukidubi.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ae1b7a67b---16303293937.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=download+cheat+bully+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d64e.bin
c46ffc8217bdd842450ad9ef993c75d2f6d7b111c7397ad6503e40351e421861
pdf-font-stream PDF embedded font (sfnt) at offset 0xD64E 17492 bytes
font_01_sfnt_off000103c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C6 16792 bytes
font_02_sfnt_off00011bd7.bin
72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD7 16304 bytes
font_03_sfnt_off000131cc.bin
90402967a813921d24e640e80da16b60dc54f86e85dd3b484870db5ca60dd0de
pdf-font-stream PDF embedded font (sfnt) at offset 0x131CC 10740 bytes