Malicious PDF — malware analysis report

Static analysis result for SHA-256 e27b883b6394bd4b…

MALICIOUS

PDF

85.2 KB Created: 2021-09-09 17:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bed11c417fcbd0b0ffd86406509f849f SHA-1: c4d57fc4e4e7345120723eaecd5c97416dbd2fd6 SHA-256: e27b883b6394bd4bcb0ebe052e096d57ff1ec162824440eeb54b12e9bd852d00
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure and embedded links are consistent with a phishing lure designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://king-tableware.com/uploads/files/202109091045559887.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ce4e54e72---juvasolutofovad.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109030157041717.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161379e3a31a1d---fekiliranowajisotobakekib.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/nutexob.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/ruludedararaza.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/49079947038.pdfIn PDF document text
    • http://sacc-la-chaux-de-fonds.ch/fichiers/file/47347557312.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/39824640617.pdfIn PDF document text
    • https://webrobogo.hu/kepek/loridutirenirifivos.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4dh4rtl7av9b2ek303jvvp0n82/22529115021.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613388fc2fdab---risilemog.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/tedejodidam.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/8621247440.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/34020308702.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/98315396600.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/vibojalamudelilavaduse.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/palagazos.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364e2c73220---23978532710.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/febetaz.pdfIn PDF document text
    • https://medpressa.ru/files/file/lefitu.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/sogav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+create+a+secret+folder+on+android+phonePDF 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_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD1 17620 bytes
SHA-256: 0ee866f742aa0fdd4494930e82299b50d5c6e7a6c9eedc2b1de0cca1b0bceaa7
font_02_sfnt_off00012ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDF 10796 bytes
SHA-256: 051080ee57d67c801725d6ace2537f68445df40ed3a90c1949af47cc3f995b86