Malicious PDF — malware analysis report

Static analysis result for SHA-256 617999316048e33b…

MALICIOUS

PDF

110.6 KB Created: 2021-06-29 00:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de9f6f898efc34b2cd0a4f68964d49c3 SHA-1: bd8af52df6d4061b97ccd45b74408a1c1581d5bd SHA-256: 617999316048e33bcbbf21285ffaa513650497ff1ac46b917778eedbd509f3d0
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9836

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 http://atsrealtyvietnam.com/upload/files/nozekadevawuna.pdf
    • http://bbfederico2.net/userfiles/file/28817365275.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/0t4635q9mhjqnjfnv4sduckl7s/14753886657.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/79507e20af4fb5dddb2a69ecf3b54e4e/71601800250.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3d4d9d2a---50486676494.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/7a4424f1cfb4da456def16cef261c84f/torululozoruguzavamole.pdf
    • http://banhangcongnghe.com/upload/FCK/file/giladiwupor.pdf
    • http://nfrostov.ru/upload/files/wevafute.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/505c88de180509002b1cce8f7da211bf/vixeveriporujojik.pdf
    • http://clinicaveterinariasangiacomo.it/userfiles/files/50238618011.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c705e58db7---lulikidilivawikiwulimi.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e3019175f---31198643529.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d719f8a7133---74745015334.pdf
    • http://agavietnam.com/img/files/molanaman.pdf
    • https://securitydm.com/slicice/file/bavokaj.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9a916118---sekonelinuzamuroloma.pdf
    • http://cosmik-kino.ru/sadm_files/30585183401.pdf
    • https://a2designbg.com/userfiles/file/51299687869.pdf
    • http://knuhpharm.kr/userfiles/file/20210629061403.pdf
    • https://kltccompany.com/ckfinder/userfiles/files/xafuvolofimalom.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823bfc9eb77---pitowekumabotaferaxabu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=a+and+s+name
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011094.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 16792 bytes
font_01_sfnt_off000128aa.bin
5b7abcf1ae89c26e591f63daeca55158cb3c09b112bf02ff3cee19cb6d1c7b7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x128AA 9932 bytes
font_02_sfnt_off00013e8e.bin
9f58d6d938c1c6ca8b0f2241dc2eda361520ae74f8a6daf8586d40f18470f671
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E8E 22192 bytes
font_03_sfnt_off000167bd.bin
b887945cf437158778f46edf6442e0e99dbaa88bfa8edd7cb9b66f02ad813d55
pdf-font-stream PDF embedded font (sfnt) at offset 0x167BD 4500 bytes
font_04_sfnt_off00017866.bin
fc85c0e37f54128cd5210aaf9990f2d5296070f81a4f912049511e59eed85152
pdf-font-stream PDF embedded font (sfnt) at offset 0x17866 21092 bytes