Malicious PDF — malware analysis report

Static analysis result for SHA-256 5914a2d5220b2122…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 18:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9dfe3303fc9aabf487418fe7f85ef422 SHA-1: 687c23bcaac1a4b5b0e57167cd73a6b8eae67a7f SHA-256: 5914a2d5220b2122a1260986e525c0aa5f4f9ca5d73c0c8ea4df12882b07920b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing payload or further malware. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://mptradingcompany.com/userfiles/file/16507439203.pdf In PDF document text
    • http://hyundaidongdo3s.com/images/files/beselizitoluvowemezek.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/pavuxil.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xifiwixogobokelatixoze.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/jitavotoworux.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/b3fd12f0a890029c2ea7cd6fa89e7f1a/fedatipenumapebuporapoje.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/butogowadinawup.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210919121000.pdfIn PDF document text
    • http://opsir.eu/files/file/14254676163.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/larigapinukaguwasaginida.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/31367407879.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614707d19cd24---32761264534.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210909/file/68959299288.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3716ec21f---mexoxidovewotiguwitavaput.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/69763146120.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/87466907944.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/sodotizinaxujamoduwanu.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/17478207902.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/82862210453.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/b7a74cde69e3ccd3b0c096c946df21b8/47370448699.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/53181176628.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/20916361123.pdfIn PDF document text
    • http://rsentco.com/upload/file/48913753595.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109132245286169.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/33974675069.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b401068af---17911645210.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mp3+player+iphone+offlinePDF 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_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 16984 bytes
SHA-256: 34abdd40e50c6857076c294e1776c9d46ccb863187bd9953de5a3e10102c4345
font_02_sfnt_off000121da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DA 10468 bytes
SHA-256: 73750a181e4fcb4b563bfd49b567a21dd890b3b9cb8d64eb84ad4e8ba164d5f3

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