Malicious PDF — malware analysis report

Static analysis result for SHA-256 59baf048f3698573…

MALICIOUS

PDF

104.8 KB Created: 2021-08-06 06:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ade12f068c6f3360759ae04cb5f6718b SHA-1: 045ddb2f3d78f4269c12237b783fed76e5c13f98 SHA-256: 59baf048f3698573d1abdc87a9c6167e9a76468e7d0718c4a08614710e00ccbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to websites hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160706b37eb8d7---69155648148.pdf In PDF document text
    • https://agentcctv.com/userfiles/file/19660191392.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/jukodafetazuwumimulepevux.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/sesolixefemezakedukotet.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/11467714769.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/303a057085fe56445cf4c22d0d114439/45041272920.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/lesade.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d3050d5c---64827039702.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/vototopetomitekepazujesuf.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/timexekitaniwelit.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/08f122bef4ec2cdf750ea6a7c1838aa0/94681355261.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/5t63368qupodlsk3ado58mcijk/96225559554.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/c9c167be1db84c3624d77d0f4397461c/14752952255.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/5225189621.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/6ohtbmn62o4mvc7cm2vkveh7f9/567926160.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/3957650448.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210625194637.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210611010503631.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/febe012c64566e544c627e0993d92bab/43637025248.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/40377862082.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/31616740969.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/cb7e930cc97176af7c3807502f309ca0/14570455648.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/52c907bf7a186eb089539fbe5462c9dc/18797293573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=wario+land+4+gba+rom+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_off0001345f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1345F 10728 bytes
SHA-256: 67bbaabba9cad0f055a38713b3cf3877606df84bff37885b6943451672b039ef
font_01_sfnt_off00014cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCE 17996 bytes
SHA-256: d40b7ce710ad2f660b3b762f9eae737c2a22019a668e3028c20a3a6b015d69a2
font_02_sfnt_off00017c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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