Malicious PDF — malware analysis report

Static analysis result for SHA-256 fced1b7610a0a2a4…

MALICIOUS

PDF

81.1 KB Created: 2021-09-10 19:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6f7c57f393413f6680969f68e666eca8 SHA-1: d8e0c97370a096852ce8014c5f94a8f6927237e1 SHA-256: fced1b7610a0a2a4d32bb4d878dcd34bb772ca703d587c98d3e5e9c109fa4e38
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://chcial.ru/uplcv?utm_term=animal+farm+study+guide+pdf PDF link annotation
    • https://fpcofmacon.com/nbloom/fckuploads/file/tabigoli.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/48867499039.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/76478769636.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/dokeguvuvotopowovaf.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379107c1409---wegiw.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907003531.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/98474678542.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/zovabeves.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/0kt6ok64thbpp4gh25mk9fdq9v/soselaridiseteruziluz.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/49527014585.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/7787605988.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/99719540514.pdfIn PDF document text
    • https://clinicscrm.com/img/files/22379472111.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/v6r5ffcmfqg10i2gonqgf5n8j0/31271074692.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/91302089922.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109021424163303.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/12370076728.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/7797bf7a99077d9b27b2cebf6d803da6/99284197062.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/bifosima.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb996616df---fikifopexinem.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/20154022816.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/vogam.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/63222258941.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/ui4rtvj6485f0uubpbgl8uub84/davomapimezifuvix.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/tifijebojedukatuxosil.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD969 17196 bytes
SHA-256: 1f765abbc141614448277c46de3152162a7e8cd32ed3a9df83b4cb7b01473f4e
font_01_sfnt_off000105d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF0 10916 bytes
SHA-256: f8e701b7fc436be9d1064835d065592ab8db8e4f66f1101431580c2d4aa9b28a

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