Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7ca46eb185e25a…

MALICIOUS

PDF

87.9 KB Created: 2021-08-09 12:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51a51623713af56b887595b02d1ed4c8 SHA-1: 1245780ba26176d7dc3f3c358131b436fe7b7662 SHA-256: 6f7ca46eb185e25a45aefc0269dd154a7e33e9ae812186207a25880649cca087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and compromised CMS upload links supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/vqtmcd3bfr2meve5d6ghi7vfl5/78663513679.pdf In PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/nenifarovifalawutage.pdfIn PDF document text
    • http://boxethai38.com/upload/file/kigofuzokamogope.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/wokeruwabawuronagokeza.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210707124442_718702.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/pozizin.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/13875350813.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608784f805670---palarozagitimovofiwes.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/17163584489.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/13916869ed46c7751e10cf2da679a710/nuwasuradobika.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/468090303bb827910ad80477856abea5/sebaperupufi.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4i0tec6tp3lv6n3pn2hmvnk5io/21204808454.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/mubuzuluwezeporuxusijipa.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/41116570392.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/xaziziz.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/83d36b61d4b04af0bb8904c90dd19950/84193099753.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/99989696030.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/jupexidiwik.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/muzudorupimefavinapewekox.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f82788636a00349da2af07ccda51d65f/70959637490.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9cd11dc3461336201d75ecf33b5aa374/67925953663.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/e285189a1effb56680564de3ed75b836/67362336247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=best+keylogger+for+windows+10+free+downloadPDF 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_off0000f42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 11048 bytes
SHA-256: a381499746869290436076b42a1c5c2fedc5841fcc58d070bb108fe5d7353553
font_01_sfnt_off00010dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFC 16756 bytes
SHA-256: d6f3bd3f1446bf314a70333c8767f8aa5cb0c58beef5f56363f17b1465947cbf
font_02_sfnt_off0001397a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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