Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d30879bedb4cfc…

MALICIOUS

PDF

71.3 KB Created: 2021-09-01 17:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6e01ce501451af531e11996799f8784d SHA-1: 6041144922b3b9fc42151247ad311a8af2752f9b SHA-256: d8d30879bedb4cfc5deb2364d8f6c91c2a459a33f79d7980dccf28f20fffdf92
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to redirect users to malicious content or phishing pages. The presence of multiple links on compromised CMS uploads and disposable hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f3033877---74186379170.pdf In PDF document text
    • https://discovercefalu.it/_data/images/file/84614075185.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/repije.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/tuvakujuxovivej.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/23424742093.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/6351631250.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/1f2f2010009419c0a7b355252a18fb20/japuzuvif.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/88748383133.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/7296997986.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/eae9f448bfb04fa7abe16e3cb8bbbb6d/54602570110.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2d9413676dc8b24141dd9a5f70b71ad3/xelefoj.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/pulodapifogive.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/pqbh09vbqg3co48in2iq4fe298/58185144443.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/dmidodde6lnm55o2jlj15ph7v3/bewotodagirutodi.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/a4361ad774359c7ba4be7cad3c98983c/ziwur.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/47533207763.pdfIn PDF document text
    • http://keramann.ru/uploads/files/bodirepunogadabupopexiro.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070402b8c273---rifokukida.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/thcpdl01siojo7e8nosopan30v/55019102789.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16205247676647.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/fokoretakegerosipoxopi.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ee4ed46e5a3e26e2818152d2e26670b6/86834421396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=wow+classic+mage+aoe+grind+spotsPDF 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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 15680 bytes
SHA-256: e8e4e154cc3dc6988b4a5d86449d06062e2ef31d7c0e167a8802cae6b5bef600
font_01_sfnt_off0000dcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 10936 bytes
SHA-256: b830de4e9b5294d307a054535f257cfeb2a922fd989d30aec7c75c96b1f55653

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