Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a0ae08c9f76b5d…

MALICIOUS

PDF

81.8 KB Created: 2021-09-23 06:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0f1c84921479ce5ab89b075d9933b74 SHA-1: 544f0fb27f6a7f8ac9f5f873a9fc3f29d8f1efe7 SHA-256: e5a0ae08c9f76b5d0882086265fbcdda94fd50e3cbf37015eb3e8a45fba4567d
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous external PDF files, many hosted on compromised CMS upload directories. This behavior is indicative of SEO poisoning or phishing campaigns designed to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://chocoenglish.com/_UploadFile/Images/file/64643813532.pdf In PDF document text
    • http://doradcyprawni.com/images/pliki/kusevafiselikuzopavanur.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/12147582400.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/2299983456.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/57068617423.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/64435895057.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/wifowarokenujunanawafazo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614a395e6e7db---97342749136.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/jopewelapemewazuxipatibu.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/26824513651.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/losanened.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/riruwijagam.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6e5e63b3c22e26edae17d8863a6cd25d/nipodonemexavufor.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/fabaru.pdfIn PDF document text
    • http://pk.mo/userfiles/file/16604994389.pdfIn PDF document text
    • https://qematalsihha.com/ckfinder/userfiles/files/jovebijola.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/nopewofudokowiwetik.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/93602630825.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16147853190a69---majepuju.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f60696063---sipodokiwebuzulisexinedik.pdfIn PDF document text
    • http://antopol.topmebli.com/content/xuploadimages/file/9539479610.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/15545176239.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/73675938177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=12win+apk+downloadPDF 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_off0000de38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE38 17516 bytes
SHA-256: 001e1422e6cc42b9648e5b1c265847f9014671e0f283cec6d09f117d10e6be61
font_01_sfnt_off00010b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001231f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231F 10140 bytes
SHA-256: 87426cf3bc89dbb6469d8b12e5d28e5b3e5856c53cb345bd8235abb230f20291

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