Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5edd7b8ccada389…

MALICIOUS

PDF

70.0 KB Created: 2021-10-01 20:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: eef1924c98204a71ab5848962f2890ad SHA-1: 1c305483cb6f1ecd5e0b6561fc33154cfb72c72c SHA-256: f5edd7b8ccada389b95e95ffa948c037522811105aecf0e528f37298cc0363e9
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'utm_term' parameters in some URLs further supports a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=airdroid+remote+access+%26+file+for+pc PDF link annotation
    • https://softwebstar.com/shop/userfiles/file/woratofuzuvagu.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/94ee0f8d7b386f72d510f68a7be6501c/rileg.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/wisewanagiwoniza.pdfIn PDF document text
    • http://talleresjpg.es/img/file/xikovagololojilepenewuju.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/wirogaj.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/muxevifigarojozuwajaki.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149ec9636e28---benotanolejevutefubukuj.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/2163654153.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/vuwebupatev.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/50858810666.pdfIn PDF document text
    • https://melz-feu.ru/upload/rijapi.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/vefewesaxewewemomep.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/gasazaga.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/34273387437.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/97085450250.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16155791a61492---kuziketin.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/fibidabekup.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/goxabud.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/3993120289.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16150a7f1b8681---26006792812.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/50289492799.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/70431803356.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210917000223_0trjca.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/b6bc4353c87744460f10b37713e5408a/32806447255.pdfIn PDF document text
    • https://lapdonline.org/file/91376931251.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_off0000b217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB217 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA29 16164 bytes
SHA-256: ea7bbd23674e2c36ed89d0b00576a0969256974ecde81bd4911b3f82ffdf9625
font_02_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 10360 bytes
SHA-256: 3a0397b0e906ab8667152e6c3c724dc271c7b7b807f642c4b683f41c969f7a54

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