Malicious PDF — malware analysis report

Static analysis result for SHA-256 e49e33e8fb69701c…

MALICIOUS

PDF

93.7 KB Created: 2021-09-17 08:14:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f816c4cc1086c2f46308245c39a9091a SHA-1: 10454d91d30d9d8f1cd6c4e3f432349b61e8c7ed SHA-256: e49e33e8fb69701cb17a50d7cade1e1ee2c1fd5f08bb11f55ab4c50b8416c6f1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic points towards an attempt to exploit users via redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://inwebjor.ru/uplcv?utm_term=what+is+the+siri+for+android PDF link annotation
    • https://rentcar888.com/uploads/files/202109022143214670.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/63935180019.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/medijadamexesakev.pdfIn PDF document text
    • http://fygl.net/uploads/file/040412585408.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4b63580fc6f426db4a412c3e35ff249d/ninuna.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/mevibowegu.pdfIn PDF document text
    • http://escuelasfutbol8.com/docs/files/72935586096.pdfIn PDF document text
    • http://www.grifin.sk/files/33465859349.pdfIn PDF document text
    • https://urology-andrology.com/userfiles/file/tamejovunikujulujo.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/julinikogewit.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/povesulobikatevulexes.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/87755087622.pdfIn PDF document text
    • http://fitviewer.biz/files/file/doxijeloxegigega.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16132af323d2e1---lejalegugenonib.pdfIn PDF document text
    • http://umartravel.com/files/timevidobefamuz.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/xolafunakezekupijukedozo.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/dotovubitija.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/98798204633.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109101245114212.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff52ae7bb2---janamonigekegube.pdfIn PDF document text
    • http://hejia-ele.net/upload/47078629740.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/milutez.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/64905968230.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210909020831.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 24992 bytes
SHA-256: 9d8c8eea3177ef245bfd2b891a18f000647a9c0c9f1abf19d2aaba7f2b247a04
font_01_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6C 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off0001515b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515B 10400 bytes
SHA-256: acf5d9f6ef0f2f680eb6c7a653ccc2c0c916a32ab3ed891c4fcd8aea6b2e7888

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