Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe5ed55dda09eaa…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 23:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 917ef0eb0f0ce4db0d59f3e0829eeee9 SHA-1: 0afda06c3c6aeab040238c4a0884e09e177e43be SHA-256: bfe5ed55dda09eaa8f517ccf37fd209fb0a6356fc0c80656d9d27b73e6187c4c
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous other PDF files hosted on compromised websites. This structure suggests an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160bc783d80194---55768093154.pdf In PDF document text
    • http://douzonebnf.com/upload/file///75920204252.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/06/18/22213590199.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/zavudodifafe.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/gudofuxamewaxup.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/822636fd9e8fee7a76ead65227443e17/10228619140.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b2059196408258d665531e07491d63a1/35017108285.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c91eccd1a26---10384759839.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae80e855767---7631485483.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd868e5a2d4---95248753318.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a327c2b3db0---29877550358.pdfIn PDF document text
    • https://wecareprogram.org/images/file/58659749021.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/sopufulodego.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/22839553894.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0707410264---dujumewiroriwenu.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb88ac01c4---renivofomi.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/e790b0936ff6406108da3f179711d009/17318850548.pdfIn PDF document text
    • https://cartolmania.it/file/36343444952.pdfIn PDF document text
    • http://tfforming.ru/d/files/xuxuxasiluvazoguk.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/42247971985.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/55382437938.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/jonom.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098641b10072---61613312639.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/lanerovavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=completed+cooking+merit+badge+worksheetPDF 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_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 16732 bytes
SHA-256: a42882d9b3d77e666eb89b2e945b3b274e5ddb89a3a5426706d20e373a83535a
font_01_sfnt_off00010dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAC 11308 bytes
SHA-256: 0dcccdaae3a2534d8a6f48b108611d7f1750baae92cd6087446cc25c78dd352d
font_02_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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