Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7622ca356c036dd…

MALICIOUS

PDF

78.9 KB Created: 2021-09-23 06:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c37ccf244d03bb4bf051605decb96921 SHA-1: 27eaa5a5788061577027d21950e0e8becd28ee04 SHA-256: d7622ca356c036dd4a8ef17ec1799d9d35d2d050b4e69fb2b7f1b5b8de089701
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161416d83925d1---vidukavovudukaxawadule.pdf In PDF document text
    • http://ansing.nl/userfiles/file/bepazavipegupotupusuwawoz.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/19976928249.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/ruzatelabosovedugamenor.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/53007706287.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/1bfd528daf21839ae0334f51b7e124c8/jozexiwevuli.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/tuliribimud.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/695a19c099c35e591d7b8be20b4840af/22414936681.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/8330065656.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/25641988885.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/raxil.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/wenavogarolefujelaku.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/sikasopadosixub.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/file/jejodap.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/68755887350.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/53470166030.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/2719182663.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/sososeloma.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1614bcc96a3460---vonaferefesurimoged.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c3facd1c---76559551821.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/popetiwe.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/11434075909.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/ragifenedizunaba.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/gisudatibobulikifosine.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=designing+and+managing+integrated+marketing+channels+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_off0000d3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3C8 11040 bytes
SHA-256: 5c565894759923830678ca81df61cd7fd3141c94a228914e5de10a828ec4f346
font_01_sfnt_off0000ed1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 15776 bytes
SHA-256: 18825f2b52d38c00f622e71e86a49e86f78eedc82a0440f5bd013705dcf364a7

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