Malicious PDF — malware analysis report

Static analysis result for SHA-256 2097ac7003ef7ab6…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 09:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: edb33158fe21c5ee356055e6aa56cc56 SHA-1: 91411456e0dcbcae0f4936fb9b6359d407db7c51 SHA-256: 2097ac7003ef7ab60c333d01e2b8732ce1561cea8a7b0cdf9224609a1ba904c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm hosted on compromised CMS upload directories, indicating a likely phishing or redirection attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were extracted, the presence of numerous URLs pointing to potentially malicious or compromised sites suggests the document's primary purpose is to lead the user to an external malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161417a115c494---81864873880.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16141d54e347d0---zejaxomedaxobabunu.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/5414057106.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/24866635516.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82093808c---66370836565.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/jupulareru.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/rivesafa.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/53731383970.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/34149181369.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/47080454835.pdfIn PDF document text
    • http://esteel.my/userfiles/file/zajumigu.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/50726245380.pdfIn PDF document text
    • https://rais.bg/uploads/file/6870969610.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135bea651778---20699516862.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907160322885675.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/kutiwukud.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/xuralixuzililekaru.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/xirifixubajuvesozimi.pdfIn PDF document text
    • http://hawaiisushi.iorderfoods.com/uploads/files/76831763927.pdfIn PDF document text
    • http://sga.cc/uploadfile/file///2021092604340881.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/12110886549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=yugioh+edopro+androidPDF 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_off0000af6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6E 10444 bytes
SHA-256: 4ad0ec40f5d524a0b3473ce5241a4c1603e416179c1f42490cdf3b41755ff31f
font_01_sfnt_off0000c6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 15152 bytes
SHA-256: 7108c4c3a1e6d592d7799f609cc4a13d686f0e112d34fa902bd555e2704842da
font_02_sfnt_off0000ecd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1