Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cabade4d32f78a…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 16:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 94be92dfb1676551c12f73d1e2a5a958 SHA-1: f263e3d82cec7d8ef9360c87ae3166619a66661a SHA-256: a8cabade4d32f78a00e49a74b707a1e435647c06a73463b43426bdc7814dba38
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 sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=how+to+get+image+from+gallery+in+android+studio PDF link annotation
    • http://ogcdc.org/uploads/ck_upload/files/71452901513.pdfIn PDF document text
    • http://ckattorneys.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mukamerit.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/veralakopazut.pdfIn PDF document text
    • http://www.zaluziemalina.cz/userfiles/file/gamomonugo.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/14719265358.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jopudizis.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bae723cd5d---jagugoxeviviwaruzaki.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/sikcdcfrae7g943is92tq43dgv/wokoxixamaseximuwed.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/vabewikipexi.pdfIn PDF document text
    • http://gewald.ru/content/Files/kezotibuzapas.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/51031077556.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/161424f19c97ba---65656676192.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/girekodim.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/56140238106.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/tigojitexurew.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/71396022027.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/62727169594.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329d4e3d2bf---94147804730.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/fijoxejuvin.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/jurebadidefagutewugabimo.pdfIn PDF document text
    • http://nhatnamvina.vn/rich_editor/file/26814845298.pdfIn PDF document text
    • http://kahasat.cz/data/file/dolagewumilegi.pdfIn PDF document text
    • http://www.og2c.com/images/file/90083200648.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_off0000b747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB747 10988 bytes
SHA-256: e5eed7e419a926354c87031f767e066f7c53d2028ecee5bbc21413772fbbc945
font_01_sfnt_off0000d09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09D 16444 bytes
SHA-256: b68df6d2131e49257df2200a3ae8d7780f1245962c375ab8acf86d9233f94f21
font_02_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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