Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb20b17f02ec552a…

MALICIOUS

PDF

84.5 KB Created: 2021-07-25 06:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 775f66aca43d94da870a69ce8b60051d SHA-1: 28fdb25e9908daf2738236c6b3171e7bd9dfbb94 SHA-256: cb20b17f02ec552a33467d4ded6510fdb005699702888572bd50078d3d4e693c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_INVOICE_LURE' suggests a fake invoice or payment lure, which aligns with the document's likely intent to trick users into downloading further malicious content. Although no scripts were extracted, the presence of numerous external links, some pointing to compromised CMS uploads, indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://driver-jazda.pl/upload/file/4534109389.pdf In PDF document text
    • http://anaminfo.com/attachfile/file/17959461136.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/c127d7219a72fd2acc15a528f7f7509f/naxolodifufijikekubi.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/c59ed0bc55e9af5bcb8ebaeb1ee6f5ff/78512011409.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/42224016688.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/78b7ff9e83ffe98a279ab4d8981440e5/27212626621.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/04a5e96435243d7f0f93a093754bad50/powunodujunofukikakonupis.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/xekabibiza.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/76117883294.pdfIn PDF document text
    • http://wamer.org/userfiles/file/74654069863.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/58839595002.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/xutixolonut.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8580c6a333---morefegubekaxedura.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a65ea889655---ketabebarax.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/79538600098.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b4f749cfc3d---lafokamuluwegiwumiratav.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/gogazixasoludejijezenedan.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16099b2b1d2a2d---zaxeg.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91787295833.pdfIn PDF document text
    • http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/manikoxofop.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/55272854529.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/zivufezalupozomux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+prepare+payment+voucher+in+excelPDF 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_off0000e71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF30 16924 bytes
SHA-256: 03eb642d2dce8116eeef9557edfd615e2d9cc1041bee0301ce4efded933697af
font_02_sfnt_off00012b59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B59 10932 bytes
SHA-256: 30faef57cb42e02f94599bf28ce563a7cb71a598dbc5ad1455cd5995b149dd24

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