Malicious PDF — malware analysis report

Static analysis result for SHA-256 492b94554ebd0806…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 12:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f3cb0266874f2c74d05623be5818e291 SHA-1: 7177607db9232c0fc8d6d020bbb65335da7cd3a4 SHA-256: 492b94554ebd080668f9ffee5458d1c59ab36c132b4d7435094fe1c3c169f343
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting, which is a common tactic for phishing or distributing further malware. The presence of numerous unknown URLs suggests a broad attempt to redirect victims to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://baoyi-chuck.com/ckfinder/userfiles/files/pumosujiwanog.pdf In PDF document text
    • https://nutricount.cz/UserFiles/File/dajotebamogo.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210820181604.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/29851090805.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/tamurezovotipusipalusod.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/dd1328c2d9d623c7e0c9083f9c10c24c/popavanugavojanakevuni.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/11635582131.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f752200d9---sipevofebifudil.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d65dea77---45592789471.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/nepawi.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/081100272137.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160e5d1e0de397---goberufubalilini.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/48d4dc2c0b11871419b6a0df2854da4b/dimizaxebujetowog.pdfIn PDF document text
    • https://fotovipvercelli.it/file/japoruxap.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/forovegixor.pdfIn PDF document text
    • http://surtek.biz/image/files/20150117_003816.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021082504270015.pdfIn PDF document text
    • https://yasacompany.com/upload/files/36641281795.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/roxaxunanoriterora.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf7e4281fc---kirotisebilan.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16073cbe244013---18132727143.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/10061948641.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=macmillan+mcgraw+hill+2nd+grade+math+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC264 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 10976 bytes
SHA-256: 35a344731790bbb029129c614ff0b2c01666874f1a7d954c2968931c44ca2489
font_02_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 16660 bytes
SHA-256: f8efff00dee5a2abe63c6eb123b0fe3d8927e2cfa4cac3c355f5cd10a6d157f5

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