Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb5a6f1e1aa6750…

MALICIOUS

PDF

100.4 KB Created: 2021-09-02 05:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d823d0e7f5d9f4bac8bf13d0e55631f7 SHA-1: e2cd27e1c36e5d3864610c3ed7d141cc1924c8ae SHA-256: 3fb5a6f1e1aa67500e9bf9a8ac4abcec9c3c5495377975535359b3cf97746cf9
96 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various domains, many of which are hosted on compromised CMS upload storage or appear to be disposable hosting. This behavior is characteristic of a link farm, often used for SEO manipulation or to distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 5

  • 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://aaykpn.com/uploads/editor/files/womuboxamadafupinopupuze.pdf In PDF document text
    • http://qa-whg.net/upload/files/rovupiwotasasumexepij.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/lakekanif.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/82299736817.pdfIn PDF document text
    • http://skncn.com/u/files/kenuze.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608422033ed17---bekidomatovebaj.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c70ababc---51935165216.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/80280058924.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///9641614393.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/42702465706.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/08/22/file/96723612656.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/nolowomelagegorusogelape.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b5150a9b5d2e8cba86cb297d85a5ca61/xokowetifafajifutijusil.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/bosera.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/85544074362.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb2bd37913---pupedamizob.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f523626715---gilumiwuluzexefivalog.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f21fb52be14---sexamunorosetonasir.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/bcaf74ea8a7e79a446d96bc1cadcd9ef/93674416746.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/nuvapi.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/e8e06f125a9b6eb4071d10fc78857c38/jiwupukaxa.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/81842334264.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/83423557347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=puppet+tool+after+effects+downloadPDF 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_off00012362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12362 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B79 10708 bytes
SHA-256: a78d740f0cb6be0900fe039b7cb0ab08fe6dd7cdbaa8ae648cf1d391d281e4c6
font_02_sfnt_off00015446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15446 18488 bytes
SHA-256: cfd69c3cbe728ccd210c4ddd686c81a419889ca605cbf11b82be67b427279ee5

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