Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3aee239977d395…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 14:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9808ae534967c80f344d2c693873ecc5 SHA-1: c397150ef5ec7bda5dba08923251deba42ef575f SHA-256: 5d3aee239977d39500d83f3e859babf993f741baede505cedc48f1b2be25380e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160846ae700f47---29395499539.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/f5ea6c1ddb04d4b259e014a56af2ce05/5926065626.pdf
    • http://around-sicily.net/userfiles/file/nojetamuzo.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9ff600d6d---5797095433.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/fb3982357061bb6733e4e5ac0bf1b9b0/xutoteguvuwekokapepoja.pdf
    • https://cargobull.cz/res/file/14366599333.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16126b671cd115---52440356424.pdf
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/70079984030.pdf
    • http://metallpress.ru/files/60806248374.pdf
    • http://northjerseyseniormenssoftballleague.com/clients/2/22/22e10641a135963e7b476298ec508c3c/File/72273696692.pdf
    • http://zhihepvb.com/upload/ckimg/files/202109040909228036.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6a2322ce8---933085807.pdf
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wojedidu.pdf
    • http://muslimofwestbengal.com/mwb/editor_upload/files/magakoletibefujo.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/90817208796.pdf
    • http://ldksolar-officialliquidation.com/userfiles/files/60699375045.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sdvtf3sv2o2d6otv6arv1i36jk/jizawewiladulusenoji.pdf
    • http://uralinteh.com/uploads/files/tajukovixekikavu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610aa189a916c---46828743034.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c43cc222fea---lunozeruvawaletegumaz.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/bs8dmi3o2oki1p230vqp8ptfg0/movemipenakazirenunepivoj.pdf
    • http://heyumpnd.com/userfiles/file///41444452818.pdf
    • https://mariellatriolo.it/public/file/35937449859.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=list+of+ptsd+symptoms+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_off0000e03d.bin
a972384edb1d9f05550d12aed6d6977f1f1a3831d828c0c709b8991f82e74824
pdf-font-stream PDF embedded font (sfnt) at offset 0xE03D 16992 bytes
font_01_sfnt_off00010cc3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 16792 bytes
font_02_sfnt_off000124da.bin
81e0d977b4929bd3a618cb4f531a793200f0cbac8c7b8f4288d4bab379880aef
pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 10188 bytes