Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9602a2b64ea5c8…

MALICIOUS

PDF

88.2 KB Created: 2021-09-01 20:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 44c177fc1540b366973636efc234d879 SHA-1: 4d1d4161b1fbd72fbd9b585e5ef48e701a481448 SHA-256: ec9602a2b64ea5c83ec65f9383ce207857f8592fc302d8095172560f051c6de6
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://baraanduliaptti.org/userfiles/file/bonijafipixipaduk.pdf In PDF document text
    • http://mintaialuminum.com/d/files/69162823660.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/gasukepek.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/58783354736.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161086e6377012---93827147032.pdfIn PDF document text
    • https://aildf.in/userfiles/file/maxarolisixutizu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4ffc14e628---80118503183.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7f9aab2129d6b4bc3008cd4f63ff97b1/lenidutok.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160d078f1e43fa---25707717327.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/89ed3ac1f97e3fe0033a574b013c0be2/84170533154.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/19298173231.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91b3b1b7d---91238455636.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/sevusimewapizosusamafidab.pdfIn PDF document text
    • http://3q1p.com/upload/file/210617123732031582zo3yeliumh7n.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2dognpf6aururh6pb3dmq7kkvm/pezafuzu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/fdade03caab111832797bb5ba23a1905/10440696606.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/4d26d4d8a5e5e07a373cda98f75a388d/mutuxodutezifemipupizipar.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/judogadilupenekobug.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/tuzuxofadugoruwenoxozus.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609917a004f9c---88241641016.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c496134ef67e4a719798587655b683f/rodawon.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7e773aecc---korimivinemumagifa.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982b2f3acef---sekesuzejexenutagebog.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/kitibagol.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/85109836036.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c167318c---19416661911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=is+running+5+miles+a+day+bad+for+youPDF 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_off0000f470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 17096 bytes
SHA-256: 6e4dbfcdedf2cb61d3ec34f9228656d3180c7506d323e044929a38a011853719
font_02_sfnt_off00013896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13896 11036 bytes
SHA-256: 26f4e33027990513191b71d3bf5a3da974fe09d3038c2a3fffe8773f2b257d91