Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1586df1ea10bfc…

MALICIOUS

PDF

83.7 KB Created: 2021-08-21 08:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8f3b27a837a32eece6c859b52c691fec SHA-1: 4ed9219f7a12e8d7bb928707db753ceaf5ccb5cc SHA-256: 7d1586df1ea10bfc1ad7d57acccf7fcd3525bb860aa6799cb397aa9df3fbb8b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to numerous compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=poladay+cp+teeth+whitening+reviews PDF link annotation
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608a58335912f---rabudusuv.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/kodafavunageko.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd62aafe42---juwowo.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/mowezarulo.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/vupanelakapigokepaxu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b392366f0e95b912e88accdd649d1b96/21008751836.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/dunemefoxinetisoza.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/wojipu.pdfIn PDF document text
    • https://laser123.com/geektic/files/xelot.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/a5cf8fcc35481dadf3d1fcf1a9bd1710/kewakexu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/a9585051bc3611c6020ed1fab32c4e71/zexifikanodojote.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/lupulemuru.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/79541766201.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/892618772.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/375bf7590b7e43c662a771618e34f3b5/43298680650.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/44fbf13a5ec1aabbef898b4ff02da389/29239590823.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c410956500---9305047712.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff723533bb---5221232091.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/kutetumawovu.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c688e477da---dexodu.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/naser.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/51216390973.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/045e304f1d825979d7cec9e9803596cc/xoginifepixawenokudutu.pdfIn PDF document text
    • http://thetownsendfamily.net/clients/a/ab/ab79602242cca8f930cd52af13df1d51/File/12482613113.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1ad681eff---dopijolujumozebewonokeme.pdfIn PDF document text
    • 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_off0000e2f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F8 17248 bytes
SHA-256: 8adee081e44ab7bca11bb9a76de024bb4b56424da6d5f842f5437e473c5dfddb
font_01_sfnt_off00010ff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001280a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 11060 bytes
SHA-256: b1ccb8cc6b1fde7f7fca1c6a916d81539baf1ba8f6650fb1e9474ad3f2f89ab7

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