Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb017d720032138…

MALICIOUS

PDF

71.3 KB Created: 2021-09-17 11:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d20459df7a987ae0baeadefb103d72ab SHA-1: 435d1069e2f612500e44de3e6f3dd51a8eee7785 SHA-256: 7bb017d720032138cef30086a40885f22a8941edf0c6300e9b1803324c41420b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://medvor.ru/uplcv?utm_term=how+to+view+data+on+sd+card+android PDF link annotation
    • https://buzascsaba.hu/userFiles/file/pogomur.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/tanaziniwibitizazavaze.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/16283099130.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/89504011188.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/lozumorodoxonizusoliweg.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/3124378964.pdfIn PDF document text
    • http://petrduchek.com/files/89950140873.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/wefiwowitisazezebepowi.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/e19606d55c7b81d099f1cb2841b5e1d5/farakaxepa.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e20ef2c866---liremulojujapovoduwetel.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/fizeg.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/88138503153.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/14707951551.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/65524701629.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/marewamusugigawajo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdccf3d61e---27055438395.pdfIn PDF document text
    • http://gapp.fr/medias/files/63072384784.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/monusifido.pdfIn PDF document text
    • http://chinahongji.com/d/files/pizikimedufosib.pdfIn PDF document text
    • https://rjpexport.com/files/75065537024.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/oubjmlqkv5q0cnj5q61t08ao1o/zakirugexip.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/79656825951.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_off0000b713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB713 15912 bytes
SHA-256: f86ad47e64d8d32585050202fc9dd28554b9c29668e6e47065f8be25ae3a39ad
font_01_sfnt_off0000dfd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 10460 bytes
SHA-256: 59d4b09b0b79a49152cc2fb1337d27c394789867c740ec94a257e9155da5fa13