Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d496662305713a…

MALICIOUS

PDF

82.5 KB Created: 2021-06-29 07:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 269ad4bf046228b709ea6b33d5a94f87 SHA-1: 1b9945b680393d59582cb1390a8c8c3b38b46f7f SHA-256: 71d496662305713a0bc0252bb1723f81d82ffdf37f7c54708cf66e8f359d5133
204 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a download button lure and instructions for a password-protected archive, suggesting a social engineering tactic to trick users into downloading a payload. Multiple external URLs are embedded, some pointing to compromised WordPress sites, which likely serve as download locations for the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=frp+bypass+addrom+download PDF link annotation
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/b7769ca09a20cdc7020d5652c8577277/16789215124.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/10730133004.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/9901898899.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wosurejezusawutesuvu.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/36684607395.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/452b94c9c55d561966482e666c3d7b06/52709278004.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073b583da8e6---pimifonitajutokadozuxoji.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210611100504_z6c493.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/lobojusoxudubuma.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xizawozozofivideripej.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/27221945141.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3d68454eab71b5d1453e312ccd49fbec/17227175959.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/dinagebidituzapodu.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/venogu.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7d9a557c902fc8d3211d0808838d6bd6/95050182796.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/virupejevuninesuwinoduj.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/23ccf321946d7da5df732e03519ece37/disimep.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/vfk0tgvft6ud3cn1nhelbel023/vupipe.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/3913b3982f4e94035033a02aa547f5be/fokuzizivobaderomakopebo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a422a762582---kiwefuwobok.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/9k7submgop62paum81t2rivb76/14526074034.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/gupuzafemit.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_off0000dfd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD4 10548 bytes
SHA-256: 497fe7216428e033524357dad058f2dcc2da60347b9f1a346893bac136bae20a
font_01_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 17364 bytes
SHA-256: 79be5a9d02a3d9ac3f13b06420b74f939150dc4b7de4fbc6879ceab6463a1193
font_02_sfnt_off000124f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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