Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf517408c4dd569c…

MALICIOUS

PDF

89.0 KB Created: 2021-08-20 10:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e2eaaf7c62358a87be194ea23bd66c2 SHA-1: c9b97224fb887f50c698ddfc06e492f66018138c SHA-256: cf517408c4dd569c5dfd0b31f9fa2a52bb0023d5d5da8c639e2d62564ee5a070
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. While no scripts were directly extracted, the PDF structure and URL distribution suggest it's designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 http://iccj.jp/images/uploads/fckeditor/file/gugobigunajesikodorag.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082a711da102---wapikonewizoku.pdf
    • https://bestcoloringpages.com/userfiles/file/zekiluwowo.pdf
    • http://flygarfield.net/userfiles/file/kadepa.pdf
    • http://renovator.cz/files/file/5831945730.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8b8308b7---37013449367.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/2fjltaf0so87o29m18hoie2n66/walazelox.pdf
    • http://builderall.info/userfiles/file/73146868706.pdf
    • https://flardochform.se/userfiles/file/526085187.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/27200116688.pdf
    • https://addsfly.com/userfiles/file/44832602849.pdf
    • http://dpsszczytno.pl/photo/file/netutesaxukalapagomepo.pdf
    • http://brandnewgoods.net/userfiles/file/nufiwezamivalanuwof.pdf
    • http://timeyear-v.com/userfiles/file/90702749683.pdf
    • http://onnetsolution.in/userfiles/file/89840211973.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/auiacpad5674cs231nang0luva/73404948632.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/muzoti.pdf
    • http://nousgarage.com/userfiles/file/71536695812.pdf
    • http://www.derbysignandgraphics.com/uploads/file/jowefanakeliferepotederuv.pdf
    • http://fenotropil.ru/userfiles/file/mabuvotezanav.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/890ddc22b2bd4e5442c79e0389ecd17d/goduzaxaxu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+do+you+charge+a+stanley+power+to+go
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f427.bin
521c1cf2b886344a0085cdd19e00198639c46823b4b71281131688b8886b9263
pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 10992 bytes
font_01_sfnt_off00010d81.bin
5135bd2d2738c2927905a9d92dfb57625dece33aec0a3740834fe8d0477a8d3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 18384 bytes
font_02_sfnt_off00013dea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEA 16792 bytes