Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab1fa8f08f08d061…

MALICIOUS

PDF

74.5 KB Created: 2021-10-11 16:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d0ee700997de11e84fc28eed2a254dee SHA-1: 1bc920ea3ec3138a6ce9d43c542e33e5c59bdc00 SHA-256: ab1fa8f08f08d061a4e0f271a55d541d0da32c6fcd6d99d1092b2608c9128b56
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://gibisch.biz/files/files/zovilanosikezenenejexipaz.pdf In PDF document text
    • http://sunrui-ti.com/d/files/rufakigidoboxezuv.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/nuxefofibo.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/74214803346.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/11829793928.pdfIn PDF document text
    • https://planbmedia.hu/files/57101161300.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/25292293060.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/bitad.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/wabazimeredorolo.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/31689006658.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e92a04304c4bb7152b8bbfaa341c6415/gujuvizajinozawilopub.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/xevuzatupunekijexo.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/31183001453.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614677d5c272c---gimagagavumi.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ejak3l7mcbujqunnqb00m91hv4/tadazut.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360e32e1494---desasusupuxafuxexoselaju.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/jetaximuw.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2beac6ba7---77307903243.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/wubiropulutoxawewazofog.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/5444530780.pdfIn PDF document text
    • http://cx-gl.hu/images/files/puwuzebigogagaviv.pdfIn PDF document text
    • https://wmu24.ru/media/file/20174866809.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/70740444528.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/3767309326135d8242dc5c.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/UsNeCLCzgYg/uplcv?utm_term=shar+pei+boxer+mix+puppies+for+salePDF 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_off0000c27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 16016 bytes
SHA-256: 819fa0155e8cc114fa0c25151e43a780e894702a2077af3e3368ca102eefee9d
font_02_sfnt_off000103ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BA 10836 bytes
SHA-256: 9d7ed559b1b615ce2e54621405dbe45de100f9253d33257e96cd378088de2fb7