Malicious PDF — malware analysis report

Static analysis result for SHA-256 38ac84c5cb8c5758…

MALICIOUS

PDF

85.6 KB Created: 2021-07-08 08:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9762bd943b4266ced1274549c1fd167 SHA-1: ebec875fdab8ab6c7fcadc865cbd1347c1de87b1 SHA-256: 38ac84c5cb8c5758f352a7731f1556cfd55df39bc2f609fa263a1929b125e541
196 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs hosted on compromised websites, indicating an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of 'cmd' tokens in the document text, though obfuscated, further supports the execution of commands.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088447da3710---nefagugimekekuwopi.pdf
    • http://thankschicken.com/uploads/files/56010908832.pdf
    • http://cocoal.com/uploads/file/vasev.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700587451a---fanujogesabexopem.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d3cfe072b8cabf5121add8793d55b95b/75634194496.pdf
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/cce4682dcb4941fa0d11dc0857a9c67e/wabarerifiwix.pdf
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/xafebo.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/d0v9pt3rnmcmd3di46vedddige/39305771924.pdf
    • http://trungtinjsc.vn/upload/FCK/file/67141947765.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/xawur.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/vazaseweveduregigemorura.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0760a94907---79584385017.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b58e4740459---14286298457.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8c051ea16191e8dce195b07628907363/40920032011.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/36b5b3953827b3381736978f4e13be0e/78710187137.pdf
    • http://chalappuram.com/userfiles/file/vupuwegijuxosegabofab.pdf
    • http://heyumpnd.com/userfiles/file///15231414316.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/5725079e77ef90960f378d4d13cc7577/jatibujufuv.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/gbei2qmfd13h18dth72cv2p7aq/56307929998.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b346bef7d---10153572020.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hcjp3vmertluauh3nso5716em5/49562776544.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727432c55cd---fizisodekefomobi.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160e61be7a2daa---vaxagetazasijixavor.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfef735478---bivadugaxevosi.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/9j7tc17gl245pf0k2unj3e7q1j/jobobes.pdf
    • http://trungtinjsc.vn/uploa
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=india+traffic+signs+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_off0000efc3.bin
ea83daef23d44b97aeb8c66af71cb6d80fd97db571869cd35181103320a563c7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16184 bytes
font_01_sfnt_off000119a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 16792 bytes
font_02_sfnt_off000131c0.bin
43314c44db63cfcfd8625e808cc574e5908996ce50297fa3d244e0ad3d5cf850
pdf-font-stream PDF embedded font (sfnt) at offset 0x131C0 10448 bytes