Malicious PDF — malware analysis report

Static analysis result for SHA-256 82afb6d10d60c6f6…

MALICIOUS

PDF

73.2 KB Created: 2021-09-02 22:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f68b6c97c974c87aa92e3d62ebfca422 SHA-1: 570f15b4f2e9b75a4206cb9bd52cbd478dea5cda SHA-256: 82afb6d10d60c6f6566c6659c3f2366a6c3389e91219e1e6144275db16669c3d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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.
  • 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=yojana+magazine+pdf+2018+english PDF link annotation
    • http://probeg2000.ru/files/userfiles/files/60245059549.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c27efd908f7---gopapuxukivatozuwogiv.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/1rpbklailrv5nrnok0a95bgbkr/7195041631.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160759560ab6b9---35443468281.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/tulisadexepufikiniw.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ee9d5c71601a647cf59c80073315ff73/javoziwasazipiz.pdfIn PDF document text
    • http://tcihk.com/userfiles/sujojulabazef.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/60663783002.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/jibapimonedenefason.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/lesizogupa.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16108687fb22de---xizososi.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/8h00s7c6th5i87e83ri2mfqmal/62293248134.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160734b5fddb58---63128976422.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/50299696093.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/dajatakakagefafuvip.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8bccd59fd9---9231797101.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/2ca8944f559e6973b2bd6de721c7132b/93514837367.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/22696126874.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfc1c785c5---mafitipulodidemakodidafi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d241380cab---toxibobolutujobuvar.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/livife.pdfIn PDF document text
    • https://tusenfotingen.nu/anvandarbilder/108/files/5225535428.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_off0000b7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFED 16624 bytes
SHA-256: 4e96015f1e49c0521031557107a8b64e3709b50ed47df9819548895f2fd2a6be
font_02_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 11424 bytes
SHA-256: 860421aafa05a1980ef21c7b9844cba67788de3e4d62344e421add46303bad2f