Malicious PDF — malware analysis report

Static analysis result for SHA-256 57049fde101dc15b…

MALICIOUS

PDF

75.6 KB Created: 2021-07-31 05:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1b8ba2b1973c9aace47ebb21eeecda38 SHA-1: ea88f72cca78e6c289c9a5cd0ae5561502a45ee6 SHA-256: 57049fde101dc15b3d51d6496dd6067f588353b09bebe94812028844d63c3ded
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting sites, suggesting a link farm designed to distribute traffic or host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nowyhotelik.pl/userfiles/file/tupozadejiwibo.pdf In PDF document text
    • http://chiangmai-clean.com/user_img/files/fesejufasikabovezowij.pdfIn PDF document text
    • http://chrmglobal.com/userfiles/file/guteludozeresanefox.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/nalirizatedupipo.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6db70553---dipemowarureri.pdfIn PDF document text
    • http://fluidearthconcrete.com/userfiles/file/xuzisiradupokevamerak.pdfIn PDF document text
    • https://atl-50.com/files/file/88253224420.pdfIn PDF document text
    • http://ciskmv.com/css/file/3680130068.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22b4503e0---mojujerix.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ue9t3pv82opvi8954fl92n66i0/75922426440.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd86dd149b---83467245555.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/kudironagelusixagokaragor.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/31724008785.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075681ac2564---vodadomapa.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e9607a0091a---kujam.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d024072538---zivitovuxevokurufojiponip.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efc0e5bfe---nelawimug.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/62811610737.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/30fcbbb86a2f45edba45b9ae69a785af/novuzosugidepijuxoro.pdfIn PDF document text
    • http://headrepublic.pl/images/files/pipabowonufekew.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5670b9050---pafanezuluvelujalu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/nelelukukaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=subject+and+object+pronouns+worksheets+grade+4+pdfPDF 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_off0000c17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC17A 17184 bytes
SHA-256: 2b6849fbbf4bac906a27629c5d516364830bd5d09efb3764719ed4b8d444d4f7
font_01_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 11464 bytes
SHA-256: 230b2e6cf39a2b272271d7d3592d289a7d1c9cc208604339fa81f6f989224fb6
font_02_sfnt_off0001084f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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