Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff7ff1899cbce56…

MALICIOUS

PDF

80.2 KB Created: 2021-09-04 21:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: da2fd57bb1a09eab2f3cc80171a2d3b3 SHA-1: 570570501264aa308ac002474f476b4bebad7826 SHA-256: bff7ff1899cbce56370b8eb26953e0ff5bc5de36f69c8faf083d6bb12ab1ec38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. The document contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to leverage search engine optimization and compromised web infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://emailreceptionist.net/userfiles/file/fajagifiwobare.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/74b48d3f699b2a40ebb43ff0340deb45/10768595812.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/22461120857.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/96034b55a0f154e9913055fe8efb6b8e/90449066788.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/wedupesuvijezupinexi.pdfIn PDF document text
    • http://4bx.pl/public/file/xevomagugekuverikux.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/b9c632879d3ea58a0f7a013e698780da/73091844170.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/25421715580.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/d9ab9680aaacf42a23562565f5b20312/solumamulexudi.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/ff597b5aa3d82d27c80c3b1517c3f349/vusonepafoku.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///sibenigesopodipijogu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/60t68c3tdqm6i7e2ociqm15457/61698229314.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9bf1efbd456b112725dd4a0127c121fb/zemev.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/1166869735.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/riekeam26rhjmdn9equd8njjfr/12412203047.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/c10a27f3fc0f272ab9f93f22e56a3811/24717745755.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/12650675007.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/50325472671.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/xunivitatekejaninuvolimo.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e7734a24---8862267887.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/jedafifomizi.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071de52374f5---sapinusujiv.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f2a5b0dd3890fd6f1e00fc105efe7f39/samavaga.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/51519855784.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/45566749232.pdfIn PDF document text
    • http://hasyo.net/files/file/dizoxumavekepalupiti.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/37d3b161f31cd94b7664d612da9663fd/83167568899.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=anatomy+and+physiology+of+pancreas+pdfPDF 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_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 16484 bytes
SHA-256: 1e6da8233c7c4f869eb5c96e15e83a9e1fc0cc609ba6b4605b82c2c4d83c5c38
font_02_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 11164 bytes
SHA-256: 4f9d4a93e84da991f5ae0ea2319ff56f06963513115c8d0bdcd214e5ef7c6e5a

Open this report in the interactive analyzer, or submit your own file for analysis.