Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e688f332222eac…

MALICIOUS

PDF

92.5 KB Created: 2021-08-07 01:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53b298bfaa358702b1103420bee81a2e SHA-1: f4f70048723e288edc51dff34f0025b2907d876a SHA-256: 63e688f332222eacedf9fba0e72d0d442ffbce9562f1c230ee92672ad9429e5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are typical of malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=mike+o%27hearn+meal+plan
    • http://bestbelly.org/content/files/files/2471887607.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b53129be9---71071326857.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/748425d9417a3d9421099ffdec86685f/xanerirajo.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e769624a5---37668300656.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a631386ea63---jamezazemipunalidivu.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fd7cb8edc---52722990660.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160702e643fae6---46056870904.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/b4c9146673ee572da104bdee9f705ba0/tamoxopevo.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/645403dcf558ed137f41662ed86ce241/18385462275.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609203fc9ce0e---14123060006.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe35040942---22261191171.pdf
    • http://phrabat.net/UserFiles/File/gimivaxe.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbbe91ed13---biwigovefamov.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53237382938.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/widopunorugikinoki.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160705aa097da7---90543308283.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/29169987090.pdf
    • http://mixmarketing.vn/upload/fck/file/62118835423.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c3ea3620d---samonezomimajexuwozobu.pdf
    • http://ferramentabelleggia.it/public/file/90041635200.pdf
    • https://aduanaldelvalle.com/userfiles/file/79382516113.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010539.bin
cd397b4133e8d8090e8f2f6b63bd70acc9f55de09573c8d25f4a81517071a16e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10539 10368 bytes
font_01_sfnt_off00011c64.bin
12718b4a4e943b05b0c1d820a8bcbc6bf2a76422b1877ea1ee3b1dca2b87a467
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 17980 bytes
font_02_sfnt_off00014b1d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B1D 16792 bytes