Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26773b44a363b47…

MALICIOUS

PDF

90.6 KB Created: 2021-07-20 08:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b5b056d21a61d82889aabec9dec5acbc SHA-1: 0fe83c4ca32138b92441723575532ebbfdbadad9 SHA-256: c26773b44a363b4780784600fd2f4535a60573a633c965dee0291093f5efca05
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs, such as http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e1ed2673c---gajuj.pdf, are key indicators of the distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://doluhosting.com/calisma2/files/uploads/11161166917.pdf In PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d80ce455a---92600611308.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/f6ebeea40eda157ebb3d36f2ed9ccb4e/kakedokebitiletuzene.pdfIn PDF document text
    • http://0851gay.org/userfiles/202106file/2021061222220970554.pdfIn PDF document text
    • http://zenithmetals.com/files/81655970431.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e1ed2673c---gajuj.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160d2289bb6400---kedevib.pdfIn PDF document text
    • http://hydrem.ru/images/file/gepawikafikinotegi.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ea600949a5d99b4599ea20890ebb6318/bapemaxefewoxikod.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/78613598291.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/32938681353.pdfIn PDF document text
    • http://iwishop.hu/file/ledujofuwa.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/88482785640.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/6cc4b5f84d5ce5ddc97df29ed0de0b99/goxefan.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/dukigoxozigovabedaxipofi.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/90108230232.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/sejis.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/korekek.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/cb584abed0b45a33dc3e25c22ceb387c/34928978718.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/3545778215.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/158cb47ed2cad93c10afebcc47eac14c/manavaravefekom.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a350a2c73a5---37012777871.pdfIn PDF document text
    • http://unitjaya.com/contents//files/96499428616.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7a138ca30---4977363225.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/h1fud646c9vjg4ob0t4etpm3f4/81425961687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=icd+10+for+bph+without+obstructionPDF 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_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 17500 bytes
SHA-256: a02f48b63ffa36b39e69102f204e6637f6e420131b406692a0c4de48c2d4520d
font_01_sfnt_off00012c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001441e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441E 10828 bytes
SHA-256: 1daf0380631b8b3a96f03e1bb949c834444167d89bc022b6324106eaed2fbd2d

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