Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad193b9a05ff18c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 02:21:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e3651e51e8c0499dd94d8f5d06d9be7 SHA-1: bdcd47cc6b05a674901bde87bcefe7b2dfe678da SHA-256: 9ad193b9a05ff18c53f9b1340df85d344c313f18cb09502398b778464b7c53c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often leverage embedded JavaScript for redirection or exploit delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb774296a0---88445592563.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c952606f5f---lujuxatuko.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/72373876301.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f29a4f5c2---80277309667.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/ac5eb3834e61b63599f388bf3213f4a8/jivatanuwivigifuwazerenib.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/r1hbl09764u7sd1fqltib09d4l/zemos.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160792c77e544d---zimotut.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/puzasodapad.pdfIn PDF document text
    • https://astek-telem.fr/userfiles/file/51385157654.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/76825740734.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c935437c41---17265285758.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qr8vl5d719ab876qvkfnksi9a4/lanalu.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b508bf3a32a---nawudenapedug.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c6afb6246---87457965508.pdfIn PDF document text
    • https://actorconseil.com/files/file/wujexurir.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/sekopodexaferiz.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/megozer.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210531_184520.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608235451982c---54813794632.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/bavoguzezalevimu.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/nubuzomebarevube.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792c836245e---suvesorovubosaduvagidaraf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=picketing+meaning+in+bengaliPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C9 10420 bytes
SHA-256: 53138f04289ab5348aa5161e30689382511e964201280c14661f51e4d2ee85b0
font_02_sfnt_off0000ea5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5E 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_03_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 16220 bytes
SHA-256: 27be6dad13d8a6341d10947f3f98b0df1170d7caa749147ed953695dcdaaaed9
font_04_sfnt_off000108f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F9 18576 bytes
SHA-256: 18413982f6f3ed670912dcdf0c475cc5b558562eb032886d526bf9cd5fc3a735

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