Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb561ad0a5e2f708…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 14:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 876546e36d2341e27a455f3c500b3ad2 SHA-1: ae6f55392e0c92ebede0ecee9be5a9101290efa3 SHA-256: bb561ad0a5e2f708e90ab56373fc53903f0582225be6ab54853e833dc39a5ec0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://krukewittfarms.com/userfiles/file/wuzelababa.pdf In PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/bosep.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c8d6791b0---67408103297.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/5bc8be076532d88f280f27ca3616f611/24229475775.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/zosunojobaxer.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/kenixuzokes.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/56703153177.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/rijutigetotagofazop.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/54949439623.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ebbf42c68---71713144282.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/1738532031.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/jusokaxuxe.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/firato.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/05529e132af514b40fd958e96e71c71f/2249272636.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/mavudamivubekadeden.pdfIn PDF document text
    • https://mmszke.hu/files/file/83111865869.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/17868285315.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/zaneterojovixim.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/rijuviwe.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/vipebago.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613780b8ac9ae---12991996788.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/vinolabedodonugisosij.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/zujetovoniwiwedulusav.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/limeburorawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=chromebook+is+androidPDF 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_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 10632 bytes
SHA-256: bb6dff23c8113176e723387c59e7105929153070c73fb8d934a4dc807e348040
font_01_sfnt_off0000ee6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6A 18188 bytes
SHA-256: 4d58abd7507fe998f73328152aaf489014d3e0eb389e2dc73944e25fb9d630e5
font_02_sfnt_off00011d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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