Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28747a2761e3ea6…

MALICIOUS

PDF

71.2 KB Created: 2021-09-19 01:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 622bb4b558b7dc96c8c279b2a5f4bd5d SHA-1: 45a2ff82dfc85939443893900c6931c918880847 SHA-256: c28747a2761e3ea6c07db72e672146a4f8dbd074ea3fe7fa5a006bdc73fb5fac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=cm+to+radians PDF link annotation
    • http://feach.ie/images/uploads/file/55078340127.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/morulasopepemuxareguso.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/rubuvubameradadivizefuko.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161426e0f63666---zogowopisivibukumapudo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137345fbb0a9---sadetap.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/gexotunofasugilakige.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/42406269394.pdfIn PDF document text
    • http://katela.net/userData/board/file/nafigobukirijepukafo.pdfIn PDF document text
    • https://bloc-immo.com/images/sogesatoseti.pdfIn PDF document text
    • http://askaudit.ru/price/89666382392.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/bivutuzajubudefupikepogaf.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/3325518363.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131a36eba2e1---23821128730.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614590af77964---73687978559.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c1d1d40ec---mojipaluzideturi.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/16282245841.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/gokitaj.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/jizazawobekaniguv.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/8907597463.pdfIn PDF document text
    • http://synhbio.com/upload/files/nomivizixuvejewawakofiji.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/12320638970.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/37692922990.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/nivutigawi.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/20795309524.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/84061904358.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/65346671426.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/sivuvasipuluxuzuvijapus.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_off0000b8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DF 15492 bytes
SHA-256: 8b9f15bcbd65b4ec599342fe5be7c4b9b1deba64e333dd6dd0afcbb081c3b884
font_01_sfnt_off0000dfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEF 10264 bytes
SHA-256: f3300b20b37fc0afd6a5827da67de091f0b2fa4a82a2786d62e001a4f17262d8
font_02_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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