Malicious PDF — malware analysis report

Static analysis result for SHA-256 988e8440b5d1c3ce…

MALICIOUS

PDF

75.1 KB Created: 2021-09-09 10:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7bef828d53b3f2e8d02bd6006bfd7f95 SHA-1: 358149b176548ae323312718085030296e98ae7a SHA-256: 988e8440b5d1c3ce70d5585fd53fff4e9823d9ec6cbf8cb9f82c4329f9b5ae58
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, including compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack vector appears to be users being tricked into opening this document, likely via spearphishing, which then leads them to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16132460c05db7---bigufefekarofobiwagiso.pdf In PDF document text
    • https://guruvinodji.com/Userfiles/file/muxeruporekolitalozewivug.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a8f5d7a32---84217045023.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/gujejubawajura.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/37736446242.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/69599829191.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/josarusas.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/raranirogedavijabi.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/kinajinoduliwor.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///56871852358.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/mogijofavidakifi.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/95768344460.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/merofovukutazod.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/84964410377.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/88641944841.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/77891839701.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/jafizomixaber.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b1ce3a47d123b644eaf1385c9117f5dd/46877752371.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/dujedi.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/82026023504.pdfIn PDF document text
    • http://edallyshop.com/upload/files/fegokekavopekegilo.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/4956345682.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/kusaduberadonafexizegubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=uc+browser+mini+android+apkPDF 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_off0000bff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 10856 bytes
SHA-256: a73c91ab153bce7de31ecdcc5dd7b23f38ded1eea07b81d15a7f50d82a84bfb9
font_01_sfnt_off0000d8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E5 17720 bytes
SHA-256: 2aa000b184009eef50e2316782295357da7b08552b9430721de9382083c1e3be

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