Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b76fa251081ec7…

MALICIOUS

PDF

70.1 KB Created: 2021-09-01 05:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e232de3ca02e2155aabfd6a4964d5cdd SHA-1: 2841deb21c179ddd429e71234fc14d945acfdd6e SHA-256: c4b76fa251081ec77e78322aaca6baa9c083904c2db4e6731efc1503a3032bbe
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and is structured as a link farm, with numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The presence of a screenshot lure suggests an attempt to deceive users into clicking these links, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 70 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://wastran.ru/uplcv?utm_term=nfs+underground+2+fast+and+furious+cars+mod PDF link annotation
    • http://salon-urody-bellis.pl/images/file/54301273645.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/52108578262.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/67905820714.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/nadafasajew.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d1733d1ae---bogub.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/87760739229.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021072503520087.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/p33bj0ijuj17bhf8nsvj96dvd0/73192047137.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e87e06bbd3ba5d10d71d4ad3cab2250c/pokomemalikipopel.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/35136831869.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/75470958013.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/wubalosinififejaj.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3901fc7422a3e7a113a2e8f67e7a4c2/mosixudagubelapelinada.pdfIn PDF document text
    • http://195exim.com/datas/files/xukafofabagizoditar.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161132d6f84cc2---1443624337.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/dc5beb6d7c34b5f1513f4b61712d4cd8/61745523869.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/gumozugu.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/2ebe2497f8ec2664ea10edbd9acf67dd/73539014056.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/h1m8f25afk58rc6hempt2mrbva/69326558770.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/b7c6afea4b96ce4218ba71e90c29d18c/vavuvami.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/28531506752.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/67129399358.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kozegusoluler.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/97682706026.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_off0000b4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD4 10972 bytes
SHA-256: 05f5a08598f12779cbbfa4f0e2c28f104f73e41630e550239348ca2c17193918
font_02_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 13912 bytes
SHA-256: 22bf7f38fcbacac229e6b4c213fb64ce9d8580d4223caebae4c7d100d3b524ff