Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32177de57ccdd2b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-17 08:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 71616d95f568e91ba20612e12747a8e1 SHA-1: 520d83c0b4de8c2b5ea310ee14d707b6ae3a084f SHA-256: a32177de57ccdd2b60f6c1acdfb01fa85a2d77e085f02b00d690e73a4f6be789
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. Static analysis reveals it functions as a link farm, containing numerous external URLs pointing to various websites, some of which are hosted on compromised WordPress installations or disposable domains. This pattern is commonly used to distribute phishing content or redirect users to exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://suamayin.biz/userfiles/file/zuwonisu.pdf In PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/kosovigazajifi.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/vufabatejoviraragod.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/kivolelonibojorugibam.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418f4417718---gutiseve.pdfIn PDF document text
    • http://tulga.ru/editor/files/25464865163.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/rimogid.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/risodejo.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/26443576966.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132682cc441d---lewegemasu.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210905_63C75D372750E74E.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/takewoxuvinanuk.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/jotatebetuvux.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/petazejozelalo.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/65736916255.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/18784966669.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/9cace0548151039f558e7df1d020645d/66688002016.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313a96c293b---tifijutajolovonadi.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/81613923003.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136530c1a35d---zinupowi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312548bda09---60827072052.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/bupeligejenodutif.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/16568299394.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/niratitagumutafimetib.pdfIn PDF document text
    • http://goldstecq.com/userfiles/file/xanugovamas.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/tulobolepajetufofaguv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370ff42b86e---46514043804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sample+of+social+issuesPDF 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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 17944 bytes
SHA-256: 65f3a62f1d78748b50d95d3bec811278caa24c7bb8fbbdb5cd2052fb34cad30d
font_01_sfnt_off000120ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13916 10516 bytes
SHA-256: d221b9fe648ad544b9bd2a39f959c5a3be5ea7d25b5c9aee6d813e24122a720d

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