Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5b248974ee5afa4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-10 23:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 23eabaf87b738cc0dec9fbf305855fdb SHA-1: 4ef46fa50b349d6f48cbd0b64de6aa23714467b5 SHA-256: e5b248974ee5afa49e656572d1c63334e976c54c1ee665f6c326822dc6283c87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://we2meeting.com/ckfinder/userfiles/publics/files/mazatelomuvafilagabomob.pdf In PDF document text
    • http://ngnjl.com/userfiles/files/22808323856.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/57290249741.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/12097080066.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/javetekerokuf.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902121125.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109011656391757.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/xebobifozolited.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/zawegijojavamurino.pdfIn PDF document text
    • http://rentaruedas.com/files/others/28285890239.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/balogugogobakovef.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365b8844f54---16431738091.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd87e96f9a---kiwol.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/mefurowate.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/28512065291.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/vidunuwovud.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9882b8985829084d599e0fdb4b85004b/fifomiz.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/44914590555.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/kogasofasawexibuluto.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613730404a9e5---zadujuvogodenupolovo.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/kexuwepedajezavifej.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/37aed45ce285d9e155e23d7b207fce4d/62874966219.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=jak+zmienic+wersje+androidaPDF 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_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 10744 bytes
SHA-256: 5037edc9a18370a494bf3007be48746382cf708f81cbed51266ea45ee8e5fe79
font_01_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 17824 bytes
SHA-256: bb7e4d94d28ee05cc71f109f5655d11334195aa3e8d6a47ea9ead1fb57c3931d