Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41122e77677ab03…

MALICIOUS

PDF

87.6 KB Created: 2021-08-05 16:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 8f8133d0ef106b1adfbc778fd8779ad2 SHA-1: 307b2fb23e6fa470fa35c30c5ffa6ba34d0820dc SHA-256: e41122e77677ab039ec04660bad2ec433979495b6cde235b1995c12b1d94da50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous external URIs and link farm patterns, suggesting an attempt to redirect users to compromised websites or phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a sophisticated effort to obscure the malicious intent through various hosting platforms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://infrive.ru/uplcv?utm_term=guia+consejo+tecnico+escolar+cuarta+sesion+2019+preescolar PDF link annotation
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pl6oji6k49cafgucbrsj00ll23/nujufiriwobexuzukenuloxu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c819f9a660abd3314f5f43749d44d665/muwadaratotami.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/renivotaporoxiroribo.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/tiwebobesaf.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/9j75gt1gpsbr4tcb5no73u4515/wokuwemiponolafunetadamer.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/745d0776de4379d8098305e683a63d9b/90583300890.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6fe2914fb---pekabejezafinulexer.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/953e8488f34188337f89d0b30daf7dac/41201036733.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a689c615e86---35422608718.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/59146422354.pdfIn PDF document text
    • http://sushi-belovo.ru/files/nijitawat.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/vivoranuloze.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c76f6301a4e---72876672312.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b195ecdec50---babewujoxu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1927643535609f4716538ed.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/14084711400.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/eb9d91c5e1c6278a89a92447f25a8f1e/54491218471.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4285c01d757abb9e9f63baa7e221c51a/18286130200.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/4597020258.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bb1e940351a08ca73e5580bcd0fd11f6/wepomudo.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/nopixezedamolanuka.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/batiwukukepowad.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 18240 bytes
SHA-256: 857b5167ab609dbb1e3e5739e253e665821fbcb8952eac0c6f568ef9d2e3a8a7
font_01_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 11100 bytes
SHA-256: 81bff6d94ea3de994da9e989d36dcca833df2d3a6a2d28df76cdcc0fc63bf369

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