Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d83d9be4279847…

MALICIOUS

PDF

78.9 KB Created: 2021-09-03 02:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 813c35bde11593e05c18f198d2bc13b3 SHA-1: f40430500a2dc25caa059fe240c68390621ca841 SHA-256: 17d83d9be4279847f04254a4deef82cb24fe1158b1e3ef50edb0da78b4c423ab
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 critical ClamAV detection and a high ML score. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cfdda3394---39175218481.pdf In PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160893e2bb29dd---nupobefatesuzunajebinuro.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086af221541c---jopagojurebalurogerefifez.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e813435d---32493744589.pdfIn PDF document text
    • https://bem-sa.com/img/file/2059013959.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/45633a8fbeef8189f8830a2b5b28ea87/gazijivurofevozi.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/1573882488.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lq2r2f40b39ea6odrfi6l889bs/40154965122.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/filewevijexusesujig.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/78309182437.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c884771ba53---64952916008.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/vre14bnbd7cva5sbta36knrl7h/subovemarofe.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160706b8c955a5---93506420723.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210607103319.pdfIn PDF document text
    • http://4bx.pl/public/file/29882418377.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb20a668ff---10094770891.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/fj8kvhbqi71iarn8kkss3cqd3s/nigawudavova.pdfIn PDF document text
    • https://tonitomov.com/picture/file/25545896328.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/gokopamabi.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/0c6u3sa9ift8l2glvoq76uh319/68625822931.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/291654144050.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/hrhr997kdk99f4k6objsiv0g2t/21175478793.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/fetaj.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6e8c9ae2---14311991148.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/86643314136.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91602202275.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/812c304ad09abbddb7aa87f8812b3a31/19221588068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=peugeot+206+cc+manual+servicePDF 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_off0000ce2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2E 17224 bytes
SHA-256: af9046f84b8fdff9841f03a30a2e1ec0b41140d6ff731adb1acd2a7c8fd42355
font_01_sfnt_off0000fb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 11152 bytes
SHA-256: 3ac75906495b42f2275325fadf3926c494a7dacb534d7eed34d83a52ed79d38e