Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd7ea942c9186d09…

MALICIOUS

PDF

98.0 KB Created: 2021-09-06 13:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f5588fdef350c00963b3542c8604b0c6 SHA-1: e429811fe12fafd87ff982bdc2511b97ffb85d1a SHA-256: cd7ea942c9186d097f8440e4b40431917379b6139eef4e2d05f12afd9ac69955
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to direct users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • 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 http://coreaad.com/DreamDataUpload/file/40579460048.pdf In PDF document text
    • http://szao-spb.ru/images/news/file/gagatoxurigevaj.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/93884c8e6000adbe044e55f465e3e595/12488101828.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/69144259438.pdfIn PDF document text
    • http://c-amc.com/upload/files/1197019744.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b1856769fb3---31888820571.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/18738409269.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/fb6094f904d551a76d43f35c81619c1c/15315427234.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/97368613769.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/10699074306.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/vetetoziwenabutelivu.pdfIn PDF document text
    • https://jdrum-music.com/uploads/ckfiles/files/notadinebamarofaki.pdfIn PDF document text
    • http://93564497.com/userfiles/73840377893.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/61710588868.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6778696a1---59400847780.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60b2a0793adb4.pdfIn PDF document text
    • http://fygl.net/uploads/file/110947075473.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/tazisapujebo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161185e2626a9b---23101122790.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/1fa3c229414a837385bd7f1527cf6d13/93756976160.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608270a5ebb45---zapajeveburunukekakopefa.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/31971158976.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/93682587471.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/wokakuloxufisem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=stroke+rehabilitation+glen+gillen+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001178c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178C 10916 bytes
SHA-256: a0d2bfeddc1854eb9c5815ed2f4f00de07ce5b62dea66e2608bd25cc1102a4f4
font_01_sfnt_off0001304f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304F 19008 bytes
SHA-256: 5e5b18564225da2f6da1a8b608fa714dce96b3440f06accf75411ce4e5b418b5
font_02_sfnt_off0001619f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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