Malicious PDF — malware analysis report

Static analysis result for SHA-256 22dd95b4ebfefcc6…

MALICIOUS

PDF

85.3 KB Created: 2021-07-15 12:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5666e03116251084f5d7869dc213a905 SHA-1: c6c227824b43044a41bfb89981cd8b60352050c6 SHA-256: 22dd95b4ebfefcc6d7d5bc2b8f99d683bbe824f7fcdda708fa8076389ab5aa6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and is identified as a link farm, suggesting a phishing or SEO poisoning attack. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to compromised or malicious websites. No scripts were extracted, but the presence of multiple compromised CMS upload links and disposable hosting points to a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=calories+in+3+oz+fried+chicken+breast PDF link annotation
    • http://trustycctv.com/ckfinder/userfiles/files/31964913009.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/lipaioh58aoibj764i2k1kvq7r/dukofefigemuponajitunil.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/6de3a045af1645572b8a2b07fa22834e/91773092433.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c618a7cdaf2efb110ec22824fc1bd27a/gitemakumop.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///tixumepelag.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/16823121932.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210604_E6B7D4BD2B555D89.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7da1d6c853c94f5ad58857a5e73d55a5/1554448797.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d40ac0332---mutezamexefar.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc54f2e8f---kewozabozaneso.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/2soqem5232i8frik5grkgie683/kesovepat.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/35809339320.pdfIn PDF document text
    • http://citra.cl/userfiles/file/93279973162.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073b420b0a43---dibawaxozowuxaf.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/33787023983.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f780f0ef64f8f41af08d5b7177a6a410/44796188837.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca5b9eeceb---zoduzu.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160856cc8c4bbb---56746937652.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ddfaea7b4---kitivirixerosa.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/liverenotigobup.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/3oak3rci92hkcgv0hpe8jjhjfa/jejidafamadakisil.pdfIn PDF document text
    • https://grnca.org/img/files/files/zemewibemiruvatirolede.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/54239958209.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/79665106846.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/gebamafovejunijozuziwis.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_off0000ea29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA29 11068 bytes
SHA-256: af670985f55dc0abe6b3b44de26eea3571fa8f9d6d39fa1e4bcd35706fd8983c
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 16776 bytes
SHA-256: e6caf86f7a14b4a8d06ae4eec120d3f6984fa44ce1121876aac848065b059d1c
font_02_sfnt_off00012fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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