Malicious PDF — malware analysis report

Static analysis result for SHA-256 555f979e62731289…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 09:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e4edf3ef307be4d58382c11c4b7d46b5 SHA-1: b29e855860c61175e6b791d95a2ab2e895dc8fe1 SHA-256: 555f979e62731289c8b01074b963685e589dc0c9c02d2b6d8c21125eb60c318f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, some of which are hosted on compromised websites, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bowenlawmt.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tetelolejupawo.pdf In PDF document text
    • http://thienlongadv.com/upload/files/zaniluzepagu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613670614fce4---971595567.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/levuzotobefajog.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/jugoki.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/bexarel.pdfIn PDF document text
    • http://sergeisurzhin.ru/ckfinder/userfiles/files/zadofonevonuserebavopene.pdfIn PDF document text
    • https://alpinashop.bg/files/56690775088.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/radesute.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/giposaxonetabebisa.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/sefemisimabub.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/30747225032.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/46368404561.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2723165a5---86403950930.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/gekatiman.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/dafozokefefazitof.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/nukopirapevoxe.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/36gba72g6qvqjdvndpb50vjk71/begabaxogotesixuxemofa.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/34871760276.pdfIn PDF document text
    • https://g-mtcc.com/motakamel/Ups/files/85458374561.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/50744739729.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/72565441298.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/68706925310.pdfIn PDF document text
    • http://klenderbio.com/upload/files/wajerutula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=download+android+11+betaPDF 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_off0000b2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EB 16472 bytes
SHA-256: 11c6868a043f4931d412818155ab41fc2552e650a55b6ce1db0bfb137f42570b
font_01_sfnt_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 10352 bytes
SHA-256: 92b59dc64ecf4a537f35093169e9ad3332eeddccd5f29b4f05b14e903d0eaaf9

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