Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0d33399fc5ea460…

MALICIOUS

PDF

70.5 KB Created: 2021-09-07 18:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dd71140fa4dfafcd30d3a54515b78a23 SHA-1: 975b0e2afaae79dbb28ea874239f695f841a9949 SHA-256: e0d33399fc5ea46053c91852b329afd8abd01e1b39e95ade8c9a7f14b09cca3e
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised or disposable domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of numerous links and the use of compromised CMS upload storage indicate a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://zaun-produzent.de/userfiles/file/33248737166.pdf In PDF document text
    • http://bearings-home.com/userfiles/file/zokavubaxa.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210714142035.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/11608448646.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/3484471260.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1f09bdb42---kimixorerunukerew.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/4729790874.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160904b67198f9---teketarubetuwovope.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/fewav.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f01458ba8f---zudawinevuzo.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bejezedexoxiwozolotukufo.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/nusoravadulapan.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2df610139bb24f03766efe60ab12eeab/wovotibugaxowipokik.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/zupub.pdfIn PDF document text
    • http://candientushinko.com/images/file/kevajid.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/vesuvewolivapibakuno.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/h0i2vd1huke88ru3tspjjjd086/monidawegufifuwe.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160978ed61d82d---gigobunaterid.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/f35h136eoj67cus6on3nlfo251/vemesakovuraxatef.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/mejijanaragupugapapub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=homographs+and+homophones+worksheetsPDF link annotation
    • https://mediaget.com/userfiles/files/33935162123.pdfIn PDF document text
    • 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_off0000b30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB23 10868 bytes
SHA-256: 20ab3e411f6522931cb48a346ee21bb79c7a5ee2e2d49e92e1c18922875aba44
font_02_sfnt_off0000e3eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EB 15952 bytes
SHA-256: e698becdca6ab0bf2d31531ca48d216d4aa9e9a692117ab28576dd4c1071a20a

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