Malicious PDF — malware analysis report

Static analysis result for SHA-256 014398a035a13133…

MALICIOUS

PDF

79.8 KB Created: 2021-09-10 08:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d11410fed08b00e572689ec00170355e SHA-1: c6c8da33827df59594abff92784c0fa50312d4a4 SHA-256: 014398a035a1313307019a764d95a9f41b8413fea202722eef33ef2871ddcc00
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also hosts a link farm pointing to various domains, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dodatkireklamowe.pl/web/uploads/files/37754087020.pdf In PDF document text
    • http://saigonford3s.com/uploads/2021-09-08/images/files/fovun.pdfIn PDF document text
    • https://tmtteks.com/files/49467548431.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ba740ed34---78336521754.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/misafe.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/82286256830.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/f1dhfqq6udm9dejgbc8nrgilou/fegapakajinufiw.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/kanakunuteponasiwejex.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/82434823780.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/46802785161.pdfIn PDF document text
    • https://fratellifurloni.it/file/kotasubukuladi.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/45625437790.pdfIn PDF document text
    • http://www.77ice.com/upload/files/feludo.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/gulid.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/5307938234.pdfIn PDF document text
    • http://atek-ent.com/upload/file/19361198362.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/58597d4023f01718824436783ac5d75d/90494074804.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/waleba.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/3752981817.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/46101385729.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210901084958.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/potogokikulazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=candy+crush+saga+hacked+apkPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135583f9146e---davebutezejupefobuxup.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_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCB 10776 bytes
SHA-256: ecb4bf0369332e02ab65717adf4e4accea8ad7ace4a4397f0c357be67f824ac9
font_02_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 17852 bytes
SHA-256: d46e29d0e195f6726741f1b4bd66f825f40fb2a55e0f32bbe73d238f016ea42d

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