Malicious PDF — malware analysis report

Static analysis result for SHA-256 12f9130fed808479…

MALICIOUS

PDF

142.5 KB Created: 2021-07-01 15:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 494b3eded2add7a9961e38f55016deb7 SHA-1: 7cc47c596132090a02e460cd34cf7d314de3313b SHA-256: 12f9130fed8084794dbb9dcc72d385fac015318267bc8ce72d75e1091cff76c7
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 pointing to various compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable, but the heuristics and URL analysis reveal a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://lamekatus.ee/uploads/ckeditor/files/suraxifuruwovudirin.pdf In PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/1abbdd686a58a402b9eae03ff5f05f40/fovusevarakolov.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jopifonarezolela.pdfIn PDF document text
    • http://scro.ru/pic/file/bufux.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i33qjovmhln1513fsqk44300o4/jelivex.pdfIn PDF document text
    • http://gapoom.com/upload/fckeditor/file/fosaba.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/5216812790.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/38581593841.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16077283d9e623---27653353819.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/jipemegawepo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/10b776c443fb3e5075c26440c5c2e1c5/lafelorelebivunutevidozin.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607169cb87412---waguj.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/53940513684.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d9d938ae---65776637445.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/be90e61242e751a9d15d66ad5de31dd0/dataf.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/50737535251.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/sefebuxul.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702db113cab---28381529428.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/71685186612.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/ohjkv6d1t875obthrj8ap9tq6o/podegazapuziwelurusan.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/61087466954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=south+view+middle+schoolPDF 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_off0001caf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAF9 10596 bytes
SHA-256: c19553e1efd6642061507557687160b62bec9a238bf69d86a954a4175b402681
font_01_sfnt_off0001e344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E344 18232 bytes
SHA-256: c488458ca088741cc0a7216ea8d3667dfd666c82ce58938b6eaec5b84cebbaf3
font_02_sfnt_off000212f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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