Malicious PDF — malware analysis report

Static analysis result for SHA-256 839699b5b4c397b6…

MALICIOUS

PDF

161.4 KB Created: 2021-06-29 08:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 896e28de4cd2eecf2bc8894d217927d0 SHA-1: 1348293e00c95102624b6201467230b12437e8f5 SHA-256: 839699b5b4c397b62473c214b2d2f4c0de4ebb6f80b9322cafeb2241751a7607
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that point to compromised WordPress sites. These sites host further malicious PDFs, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9511

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=how+to+get+oathkeeper+destiny+2 PDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160809d9bcecb0---16856938817.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/16a6969a85e3f50d09d516884423f851/laxidarotaseluretuxel.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a949995f1a0---fubugaj.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/24115403874.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6169d0c27fb1a324b045543bd8795942/30009220237.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/6356295612.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/185f749f77b8e69ea2525f964e094284/51644083820.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b7172d8db---37372950183.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087941067047---beweloderifazuluzuni.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3f28b30664339e76bb6f5fc8b7e5d256/54371727728.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/5da863d81437cb15e43bc2ecc6d8d9cb/zofibiwararubexev.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aaace31130c---vufuvegizilasisutukokiw.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/87371566498.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/wugexorawemu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ed1d9df1f861a2013bf1aabb62e56faf/vimaxuridak.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/r609et88t397sjcsg37l0btfs3/tezenuxozazudod.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/a1occs2qq41c7hqlcbl3d59ft3/dawapo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c9ca4e9eac8aaed114b137570e976663/52821222382.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea263efe3a---rivizatotufasusumarajelol.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8589f4b582---73457290455.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/55204468735.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b30b56c434b---8269292925.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad5af3a86---60395691816.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8cf420eaa16de92ec0ed866e853fb60b/34027588476.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C84D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E05F 19268 bytes
SHA-256: f713cba6e2b64ab6aae802dab4164a8e4b250723a56cc2eb8b6f878a48c677b3
font_02_sfnt_off000212ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x212AC 11028 bytes
SHA-256: 5b6bb703d5ee142f2647165bd219126088603b5050e22083ed10147e31636709
font_03_sfnt_off00022c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C2C 16980 bytes
SHA-256: 12e2cc61d7bc5f9b8702d73e8c6eba9c47de1d268fcc1fda19ee493c24d86f12
font_04_sfnt_off00025eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25EDA 17072 bytes
SHA-256: 8cb9be0bb787d14fe9c4949d61e3ebf27d05d997a29ae0098cef16eb1b51099a

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