Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38e3c8f23e3b090…

MALICIOUS

PDF

87.0 KB Created: 2021-06-29 22:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6d453822bbac594d653acca6b105001 SHA-1: c4261ec4c8915d5e52de08f6af6aad3208b70b94 SHA-256: b38e3c8f23e3b0900240fc9e42e9f8e75566694946a94684c055bc14fe93818c
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 a link farm designed to lure users to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://inwebjor.ru/uplcv?utm_term=types+of+ceviche
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/3ctuaemo60117ififd87eeh494/jexug.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5jmn4pomsrad0lmn4489qg1lu2/88966509452.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-4-30/20210430103817548141.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/21232584749.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/sfu9tgumsnnh1rvr2abasikj64/75363276932.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5ad7329b43ff9011941e485fdfec17c3/xonujopug.pdf
    • https://eqonetech.com/upload/userfiles/files/fibefijerumodax.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/86ln44f11cfsnciaqamn0f0p5b/mugobep.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/1046469133609b6b7997072.pdf
    • http://eko-inwest.eu/upload/file/67664113889.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/i1emn87pjast70a0skqkfd71l7/65294631444.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/tarasow.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ddb8a6a6d---pewimanaxofuses.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/8a7d97019c363c729c471b87e2ce2bd5/wukad.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/b397f5b37a49284e5955e89503a4ef42/tuxitijad.pdf
    • https://allcreaturesinc.com/files/files/xumufuzaxidorakakos.pdf
    • https://kham.vn/userfiles/file/gawijetige.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4dd511b0f---51717168782.pdf
    • http://accessiblevehicleservices.com/userfiles/file/84937814423.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/262588928c7f5d4aad7e9915b12f9a43/37482895270.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609879d7df537---23780807546.pdf
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ecb334de734371387a641233a6d42b69/lugitigis.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_off0000f222.bin
e46925f01225877529068b052d89f4def97dccb188025067ff6ef16a1353f90a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF222 17568 bytes
font_01_sfnt_off00011fa0.bin
025bf8d0435f62af8f62862740469b198da27a8f52df644045490737ed4e5dcd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA0 10208 bytes
font_02_sfnt_off000136ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136BA 16792 bytes