Malicious PDF — malware analysis report

Static analysis result for SHA-256 233ed3295692677d…

MALICIOUS

PDF

88.2 KB Created: 2021-09-04 09:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b6714e03bf3debc3436903a6f243f92 SHA-1: 48668d01ee0a8f8f592a1b290c0d2b72d205aad2 SHA-256: 233ed3295692677d44160ad72fbb26e0b9e81882e767c2c70e4ecb5cb08b8493
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and several heuristics indicate it's part of a link farm strategy. While no scripts were extracted, the sheer volume and nature of the URLs suggest a malicious intent to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://partnyor.az/userfiles/file/wazufametupaxidemanekat.pdf In PDF document text
    • https://macroedunet.com/userfiles/file/86843866686.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e43c7dbf8---roduwabeziz.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/sigajekegevowugizado.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/derugifaxem.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/1896ceb699f4233afcb454a22b1cb483/89268292322.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ca51398b---51982322697.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/14324914032.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/79525714816.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/lgo0cq7ec360jc0q92ra9n1oi5/84573971609.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1659843cf---51699714066.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ugq60nvtrmkn83pv6e1mrki836/logevusamu.pdfIn PDF document text
    • http://metallpress.ru/files/nupuzazikew.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/86648169446.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fb3e0e594---37852339377.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/70982404023.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/wepik.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29ff2967b2---mifofug.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1628431658_4709062b3b.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/magilogejofunibune.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/zupupafoxogurazuniloxox.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5843d1043cc9341ba2388ace5a55755a/fekujobozojudezupigure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=toyota+auris+touring+sports+2014+manualPDF 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_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10941 18288 bytes
SHA-256: 4823ac4c8ac75ed8512a34f3be930de606ea97cb2b2f1df25448b2b483dbce32
font_02_sfnt_off00013950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13950 11012 bytes
SHA-256: 33fa82d193f579495bbb2c6cfc08cdce34b71d72a4081b665d6faa0f62110a6d

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