Malicious PDF — malware analysis report

Static analysis result for SHA-256 8977b3539f9494f9…

MALICIOUS

PDF

81.0 KB Created: 2021-07-04 03:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 441d6ee15a3a34659e56dc7d06aa66d4 SHA-1: b573c069f7e0dbc08027e8468663eccef7d88cf5 SHA-256: 8977b3539f9494f98a645ce26f4dde62937a350a9d3512d4c68a4a4bab4ca90a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://garglob.ru/uplcv?utm_term=600+mil+to+inches
    • http://josephlillianmorrisfamily.com/clients/59960/File/47140303737.pdf
    • http://clubselectionvoyages.com/images/file/kizirojaluwizu.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896989cd586---femawaw.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/96ddce144408780e61d41b4a4dbddd7e/lokokefadag.pdf
    • http://younewstoday.com/task/userimages/file/83218002106.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8a45bcb078b76f29e00b1c41fe01547b/52749891215.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9f860fb38048cb9d4962375d7ae95759/katudozegelabuj.pdf
    • https://chameleoncoupons.com/adgprocessing/uploads/files/tixijonet.pdf
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/15548401302.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/e6ad8be2d2b337b01d4faeb73e3855ee/33191388760.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/44cd781bbf11c862c156e403b41de613/sugufamogibekipedaledize.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c683098dbb36838c601db45a81f4d489/bodaweditoso.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/143c0c3437825a71f4b1326ebb8bed02/62104733912.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608248030382b---64165885792.pdf
    • http://feach.ie/images/uploads/file/xedunipaboxupa.pdf
    • https://efnnma.org/files/file/xatep.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16073e64cadad9---95287997863.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160858199b1d38---jejuvozagidis.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9982005e65efd1ad896afeccb7638d34/32070049079.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/85ce1756f040ec7169df555645abe18d/madikuzuzugizabutefo.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b24d56676f0---48965566928.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071896acdaea---4299345369.pdf
    • https://pbchistoryonline.org/uploads/file/75058674149.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/945371b0446388bfc044d6b88b2d464c/62669436617.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_off0000da5e.bin
5b8706ccc5a6fc1af785c0ec64a5e9329dc2db8dcb45021e6b191854baf2d64e
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5E 17092 bytes
font_01_sfnt_off00010787.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 16792 bytes
font_02_sfnt_off00011f9e.bin
fdf7ffc12e43dd46e2e8f68890a34d6405974c12db26a4f284c99e064a718d7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F9E 10428 bytes