Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b18e360e7853e3…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 05:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 87141ea73906183361a2161cc8a54dd7 SHA-1: f041e858c63486af782b8ec9066f854368beedaa SHA-256: c9b18e360e7853e3202a78a2170386126b61d538df00ff5566b8ceb7900eabab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, many hosted on potentially compromised or disposable domains, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF-specific heuristics related to link farms and external URIs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://yourhealthyanswer.com/ckfinder/userfiles/files/96659045657.pdf In PDF document text
    • http://ichieh.tw/uploads/files/202109081301399210.pdfIn PDF document text
    • http://shyjjc.com/v15/Upload/file/20219131228174429.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210901213641.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/mibokelalisukafadur.pdfIn PDF document text
    • http://saint-party.com/media/file/muwaw.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/59741878731.pdfIn PDF document text
    • http://iccarrentals.com/files/file/zenerogitudunumu.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/80822441682.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/basudetovetil.pdfIn PDF document text
    • https://onlinendttraining.net/files/81140624624.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/c548749f9979d4c73a9f08c6ac160eca.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/53409562805.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144b0f1b0e98---dosesodotob.pdfIn PDF document text
    • http://0048.pl/48files/file/lekigusefuwisufasup.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/dbc2753125241006f2fb53670df761b4/51693096910.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/60305218acacc88b67fa7a51be73e110/xomapi.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/63463646177.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/61682052596.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/fonexemenuraw.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/56089220135.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/6786031634.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/67372480302.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/92770310956.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/84946659751.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/petizasoginibanaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=beste+epost+app+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_off0000dc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF484 10392 bytes
SHA-256: 5ff7aa8df72a31e8aab7fe16f1b5034f6697b3f3e6fed01df266919a377b089b
font_02_sfnt_off00010c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2D 17964 bytes
SHA-256: e98ca95251c267aafae1a18eb7e8fa1db6ea5fbad9491261e728b5563c5cf802

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