Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d67eea9a1a02560…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 07:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5ed04e8c1f496ef5d4288f28db5e51d SHA-1: 3273652a3d6c8e79f99c529a607a3c95c86101d4 SHA-256: 8d67eea9a1a025601b8ce1e9b0656aad2c011d2ac43e08945b92ce9bb82ced82
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=pasar+de+ingles+a+espa%C3%B1ol+un+pdf PDF link annotation
    • http://dianacb.cz/userfiles/file/42897920490.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/89987080859.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210620224301152.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/zovogewisafativibe.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ae9cce30d---29876473610.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/52464962122.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41857948c---fajutixutubaremejebuk.pdfIn PDF document text
    • https://rajatotogroup1.com/contents//files/sevilipakinebata.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d3abdb8b---88816064152.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bae5b62d21---11724184741.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1624510226_c9e06d8d38.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/wixukekibafidofulexis.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/guzirifufijutamorojumura.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/rimemejelagivekaxusedilu.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/retogobaguvowo.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vvg8c72vaa8lhn81rk39rienns/62428042297.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/29537754154.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/vojiko.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/nsm0qfmi8h7jnb18ok75id7b2c/12156330477.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7a4c6e86ba9648edaa052ef23e058d99/53744798472.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a32e2077af1---8740757052.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_off0000d0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B0 10880 bytes
SHA-256: 4a2f56eb75c442b80253c251380b02aa46f264cbf9bbdba97b19510cc8f14403
font_01_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 17580 bytes
SHA-256: c7aab465a72fa273c16022b27ca3dc12284d655e96e5f96652caeb8efe5c3248
font_02_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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