Malicious PDF — malware analysis report

Static analysis result for SHA-256 4914d9c274f41845…

MALICIOUS

PDF

86.6 KB Created: 2021-08-25 19:35:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: deb5256ea840f291cb61a40ab2a7bf09 SHA-1: c9b95e6233fba9c3d193852a6c29ec4263075cb2 SHA-256: 4914d9c274f41845ba83041529ce23b9aeee2ff551316e93dd315464f3baf44a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The embedded JavaScript likely facilitates the redirection or exploitation process, contributing to the overall attack pattern of luring users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/705a770f30cb13623051781cb9072418/36463391486.pdf In PDF document text
    • http://bogaarchitetti.it/userfiles/files/82501219684.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed93ec36f17---vanebuxuninan.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/42022621061.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/xatesop.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/10528517567.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add20fb1fd1---dewafasowubi.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/68eu0908q5cjq03kf9bvm37iln/vimarakuxatoxibupef.pdfIn PDF document text
    • http://wixoon.hu/upload/file/fagimapajamuviweniduzep.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c94ee9317e8---91839086466.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/jefazasavagerejonola.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/vujedezideluxeparifavax.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/44745847651.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/92992280243.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3365bed6d---takagisowuboz.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a7266912---baxawes.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160945d0c93137---zugiw.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83c1e37624---povejarudaxiluporet.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827bba93216---lakipugi.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/gk3opetcc3nfpfd61lvas8g5fb/nujimidovov.pdfIn PDF document text
    • https://mahae.hu/files/files/92908622239.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/rolepemipawolojikesog.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/zepob.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/zaguwiresikoga.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/fiketuvenuzuxab.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/4e1682dd9ee654d72d8dc525ff3f1abe/45649530688.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/49551715209.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/7579a3d7abcc845f473d37cba188ddeb/9456547564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=worst+used+suv+to+buyPDF 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_off0000f031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF031 10248 bytes
SHA-256: b74424821f71de532ade212be5947d5b18cde18e849f39f4bb0b0f6587bff5a9
font_01_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 16956 bytes
SHA-256: 152c17145b8ea82e883cf1d58d343b70096b216adf15172aa1ba4ecf12d47aff
font_02_sfnt_off000133df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1