Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9ebf4fb556b94d…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 12:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 24387e43dca74a03d4160978c7916cf3 SHA-1: 7dbe4bb06f55c0caa1ea48d1608070f8a44b41ab SHA-256: de9ebf4fb556b94d1c826c0c7c558489f5fb1c870ecf8f3abaa7e72f1fc01a01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=spring+boot+redirect+http+to+https PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/qljkdk2dcn6j0053jbis1dq1o3/25497434430.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e6a5a8c980232e7341fd9f12810bfbb7/zugaxexeguzapamabosi.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/dinovidarofojoxif.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/c0be3674c4e2e7c5054be2b451e06c90/vutemujunus.pdfIn PDF document text
    • http://charivne.info/images/file/vamiwemuxutevu.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/f532dfdaa756fd562869758665e38d20/10990814962.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bda5043a04c---24739245154.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/4d8b89b0e8dad34f7f7a3288507fb8ee/71619019989.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/gf9b1u8tptp6c4f10s7rdt0jt0/nebofuvofefokutawedevak.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/tapaboserekesefoz.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7d7b159ae6ef0eaff7aa49209dba0159/xufoxukerujinugoraxuxireb.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/801a00c4e48aa4d349fe825cdbb441e4/11135342152.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/23e568c97c395e59534b174be5ed4d31/85064307202.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4ee5f3a7a2---vopefujimisarofajavidij.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/kadidutakefoke.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/juxiziruzenalepogiwoxaku.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/14076762676.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0895985e8b5aa0cd2359511dc4ec587e/kefolafufojotugezixotije.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/lpbv7oatqbtr8pukpg1kf6s6uk/gujupuxesub.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/52273836261.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/ropike.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9ec89011b35a58c89ef0b6ba96388837/derosakij.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dafc3024ef6---31348458282.pdfIn PDF document text
    • http://funperm.ru/content/file/15746537237.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609703fd643c4---29089180223.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_off0000e5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C4 18404 bytes
SHA-256: 3baf9d65a93b8dfa7f56bc6348c27b3efcf600a8093d807ede1a1946315d4915
font_01_sfnt_off00011592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA9 10800 bytes
SHA-256: 6d647d4fb98a45529bb959b302e70e46b0ecc5143203f3f7c23313f75226ab55

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