Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebe5f9fc63c8b94…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 21:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 06fce7f4623ef69cec060ffd6ca72e46 SHA-1: 35f6374b7a2d4f643fd0a2d8512457681d148511 SHA-256: 0ebe5f9fc63c8b949e6629c35ef52aadc6fa7f66c55b8a663a618de17871ceb9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links and the detection results point towards a malicious document designed to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=pulsar+music+player PDF link annotation
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac723a6d31---vizup.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/48103054864.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f6b1750d6---99527904565.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/12601536581.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-10/20210910155724257108.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385ddc0f2d4---pabutikonilewona.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1354295728613355ac7cce6.pdfIn PDF document text
    • http://share-world.tw/userfiles/file/kewirafitunelifomi.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139a87bbbdaf---penifovipadavujukifi.pdfIn PDF document text
    • https://ferropula.hr/files/46389340534.pdfIn PDF document text
    • http://jcpingie.be/public/files/nowawalobe.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/ruwepozuxebonino.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/sukepadidikikedovodebin.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/mideparutodexaxo.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/6869755862.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kejakijozopuxodi.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134af667d73d---muwatuv.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/34296571148.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/92706991385.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/kajorevitanisumu.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a5aac223a9531f945f14c4bc19e5803f/sorujufobixefibuwu.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/82448942801.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/52946964907.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_off0000bd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD536 10428 bytes
SHA-256: a5f1ebc29d4d0f1361cd7c70640ec76e7bbdbea6bb57e12bcf2550c29e337bee
font_02_sfnt_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 17896 bytes
SHA-256: fb153290f1b5ac29953783e7957174f1d84af9c89b0af76e7cd3b15eebdb8cc7

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