Malicious PDF — malware analysis report

Static analysis result for SHA-256 e35250c6bc19f0a4…

MALICIOUS

PDF

96.4 KB Created: 2021-09-22 09:14:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 776b88f9cf849b8ba89e12f68f619f4f SHA-1: 1f5f9c0ef7ba419deddebfbad036af4ba97cb417 SHA-256: e35250c6bc19f0a40ffbd77e8e70c31b6bd4ffe9b8892cd65a1cf23661499ab8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads and potentially disposable hosting. The presence of numerous URLs, many of which are embedded within the PDF structure, strongly suggests a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic further supports a phishing pretext, likely aiming to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://medvor.ru/uplcv?utm_term=android+add+certificate+to+trusted PDF link annotation
    • http://realcomfort.ru/content/upload/file/nedaxugiwinuxexulebija.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/89233924036.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdff516785---52273817451.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613266a6d39c0---jamorulifilitavobi.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/180d04a56a737780c888fbe9f8898fa2/45418920532.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/12400730837.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/65221477927.pdfIn PDF document text
    • http://fxlcd.com/upload/file/kexaji.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/44221322720.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/juvolupadosozedevide.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/45186399501.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/83956630094.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/jiledonakusix.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/noxurobujajutopupux.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/11722545901.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210916101747.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1631122255.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/denuwar.pdfIn PDF document text
    • https://e-room.co/userfiles/file/jazesisatosuluvilasozesub.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ac912a6da6---9516311158.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fb0c05fd5d69862ee87f20dff790f5bf/tivewekesixunasif.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/86518594090.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f1d07646f---zaluranitifif.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/19241375921.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210905_F04F45057464EC5C.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_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 19204 bytes
SHA-256: baa3b3b80b63f3e2cba1f6e112a8f2ea616b8e7aa6d15d232e4b502f545a2bb8
font_01_sfnt_off00014363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14363 10504 bytes
SHA-256: bd09d355977465f21ee899208fd676908f43dc425d02c40b860b839d73711a0e
font_02_sfnt_off00015b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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