Malicious PDF — malware analysis report

Static analysis result for SHA-256 c732a2616d0118a2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 00:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3bc14477bf7d56fc51c14fcded041f73 SHA-1: d6dd366c81efe57a8c872ac8418b519ef6cc790e SHA-256: c732a2616d0118a28352082b46cbd13e7b80d6971263b54002c22ca95e21b3c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary function appears to be redirecting users through a series of links, potentially to a final malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c7c143f1d75e9ad0f7db33c156584652/97043602416.pdf In PDF document text
    • https://spandoekland.nl/userfiles/file/pipalewuvufitefuzemo.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/pawifizefetim.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/17832926170.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/lodobejivelamenizokemez.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/sutol.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/2c01fa635b2f581dea8a482e039694e3/91109666215.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16098a8a27321b---dagex.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/tejefegirifedezusi.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d92c0468a4c9354702da8060ec9e302e/sulabipiliw.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210528154843.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210804095929.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdd536c3a2---nesazumidemuzukalulob.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/527559ab8d7873f192f47cf53c1e7523/2122866238.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/bipogupi.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/zogidiri.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/nq0m9rbtkj9jl733004qosuls3/telibijosisegis.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/ketuvarogedanipukab.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202105310120146342.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/6eb0de5ff5db49aa1125bb4e0f337041/seveliravomuluxodomo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1b0f9fd6fe1082e0eab15ae0bcfa3827/wavimipimeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=find+the+greatest+common+factor+of+these+two+expressionsPDF link annotation
    • 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_off0000dd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53F 17332 bytes
SHA-256: e987a47740fcc453c4045e9cf1ce0f32a9b231a34cd2e45c28c7c5a9bf246b42
font_02_sfnt_off000121d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D4 11188 bytes
SHA-256: 1d6a3096f8da9f4dddcd7ca310d5385800b57a5cff23583733d1ec2af68af910

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