Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb60b872273b7e90…

MALICIOUS

PDF

69.5 KB Created: 2021-09-26 06:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cd462f324aabcebb86e9fb2d80aa2288 SHA-1: c9f6607908ac37a54c14c65403397bce4ef2ab30 SHA-256: fb60b872273b7e90c2bda9ca5c15f539507880d04fcd22a15e2d231f325088e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to numerous external URLs hosted on various domains, many of which appear to be disposable or compromised, suggesting an attempt to obscure the final destination or leverage compromised infrastructure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/tetudezojavotux.pdf In PDF document text
    • http://fskyok.com/uploadfile/files/regajorakopiti.pdfIn PDF document text
    • https://mauspro.net/upload/files/faxokivaxuteka.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/fd60a37f1a53d65465034a9b0f3f50b9/41654187265.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/43890265332.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/91486634634.pdfIn PDF document text
    • http://gamulchi.org/userfiles/file/41807823179.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b4332855e---36980635954.pdfIn PDF document text
    • https://beamstraffic.com/amb/userfiles/file/lijox.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/44404631576.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/18655941262.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/23521451133.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/594381df2f47d585f7e7e4b57556b422/83067009031.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/dewipelivulaxizagi.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///40724500331.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/14953858141.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/61736147968.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109181525079004.pdfIn PDF document text
    • http://le383.com/uploads/files/bagubaduxavibaselejeb.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/s73lcbe33oj9sk2mqmbbcbrs8o/tidogemipisiwa.pdfIn PDF document text
    • http://duet-czluchow.pl/userfiles/file/9106838893.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/xebikawuluw.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/bobakose.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/zeziriz.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/gamunamoxur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=psychology+4th+canadian+edition+schacterPDF 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_off0000b019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB019 14824 bytes
SHA-256: 964b343c95f68c3eeeb79a011fdc362095c7f38030ac777355c40b4b9b54436d
font_01_sfnt_off0000d5a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB9 10844 bytes
SHA-256: e09a8cd6b12fa7853e275c2f25dcbda79e8c8d9ed93b19c808bbd9b94d42947d

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