Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f2d10a76b270b6…

MALICIOUS

PDF

101.6 KB Created: 2021-07-20 03:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6a4d1c0cac4caa8f3dd87742eb34dab6 SHA-1: a557fbf64a6f8340d51306e756843ac1091c6191 SHA-256: 61f2d10a76b270b676db96faeb52952614e6a78e8e1790d41e69d0bd20b9ef9b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan delivery attempt. The document contains heuristics for a link farm and a password-protected archive lure, suggesting it's designed to trick users into downloading a payload. Multiple URLs hosted on compromised CMS uploads and disposable hosting were extracted, likely serving as download locations for the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://uforoi.com/app/webroot/uploads/files/wokopomozotu.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ga6939713dkaortdmfp6lhq06q/bixet.pdfIn PDF document text
    • http://feg.vn/uploads/files/26975551701.pdfIn PDF document text
    • http://robbes.nl/media/files/11686951289.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0a4d4ddd34---43519904823.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/53887420805.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ee66d66d6---4669348336.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/58349982477.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/43050953381.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e361b3aec---koxizonorob.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/sefaker.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7006a5ca9---puxozesefofiji.pdfIn PDF document text
    • http://waypl.pl/upload/File/97244177055.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/vokoxumazazujede.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778af7b1fc0---nisuruwefotipoxowe.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a425f251e5---xadelimomujajirov.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/71807271844.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087810c15aca---bumuvuzilewugiboru.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/55622063248.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160803d7cb8410---46706247847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pes+2020+ppsspp+400mbPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001321a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1321A 21604 bytes
SHA-256: eb12fc30b964c425fa250e423466e292bfc92bf5a05e5e68d01a82668904e535
font_00_sfnt_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 10152 bytes
SHA-256: 6e940c56b7bcfd1a7bc99303a340936c39ae2df18eade86842f233e293e25fff
font_03_sfnt_off000157a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A9 19232 bytes
SHA-256: 97c829ee8d3974f8f8a24e0e8b299cacaee6b45971cd276f011620fe3f223e05

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