Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbebf99db6b68da5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 13:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99ac9fe0077814658f1256fa42c6e22f SHA-1: 0d6ba1cd9dd35ca10375cd0c6f686a109eccc9b4 SHA-256: dbebf99db6b68da5fc589e637714792ad0688817afe71439bf7065073ed035ed
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nenorm.com/files/files/sirabigowu.pdf In PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/8882ae13eb830ac8aac20d3f459f9694/wobiwasusamabedamasoguwe.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609801c8dcc83---tasoxov.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a975f9b7---xunolejewifefexelujad.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/nusafojilakutugazun.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/wamefesazoso.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/vegezogegukavigoja.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f039d172be---75050471175.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad93a774958---gifitijonubosisenuva.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/91605503189.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/373bmpsq9c3ab09tnp3tf9d9pm/3049325777.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/86043886118.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/88495167906.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5984e8144---bowipiboxudeboforijimufa.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607274cc2d913---58131035087.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/bhedtpm64m6a5vnrmrt0sd467l/91555039326.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/53124803587.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/60562328028.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/33398658396.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/14730156183.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/3527d351c5d447e1c43bc55fcb273a1b/javogobaripijalal.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/11919736379.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/jozogutalo.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/41323910368.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=nova+dogs+and+more+dogs+video+worksheetPDF 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_off0000d504.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD504 18712 bytes
SHA-256: fc0b7982ba076433262218bb592daaf545d517d3fd4b15ed2b893bf1eb807bb4
font_01_sfnt_off0001057d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D94 10872 bytes
SHA-256: 37c57e0ec0ada3c1cbea185cc5b0b04c8513bbe0283473637a0c291fdce9686e

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