Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9715e2f083d5a5…

MALICIOUS

PDF

75.9 KB Created: 2021-09-16 21:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 159b4bfa6ae121e9c18992ec58045e93 SHA-1: 2e5cc575be509b795653187c62637b54538fe4b5 SHA-256: fb9715e2f083d5a5fb8d741dc80b285e3d10e936391940240f5c08151f81143d
124 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, with at least one URL identified as hosted on compromised CMS upload storage. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a link farm on disposable hosting. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://siam-royal-view.ru/data/files/38061642161.pdf In PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/favubebumazafegejewa.pdfIn PDF document text
    • http://natalieshuff.com/uploads/file/vagufikotovifibupagosinir.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/wuvusexifumubekow.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/gatido.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/257d8de1c51a85224ed98b08fb3309cd/sexadapubedagazi.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/27869182108.pdfIn PDF document text
    • http://knauto.com/upload/file///borolikeporinutuge.pdfIn PDF document text
    • http://thevalleytrader.com/files/19588742154.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/kitofeluruwadavavuzevo.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/risul.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/mifek.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210910_203517_4758.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/56504229057.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/kaxisanuxidato.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/80918342402.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/vamifanaraba.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/vasatipanikavipejole.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/21115367017.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161425c0fe34c9---vixojimaw.pdfIn PDF document text
    • https://ottopianos.nl/files/davaji.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134169fe590d---zuxis.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371a11178d9---tefaligutebujew.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0de1a840b---25539899055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+do+i+increase+the+number+of+rings+on+my+motorola+phonePDF 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_off0000c33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 16892 bytes
SHA-256: 066a1dda53639454e741deb7115e77de4f5331c166ef8c54bf5ee91196207913
font_02_sfnt_off000106ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EC 11496 bytes
SHA-256: 92e53a1bbddd6e9d5a29d800769d9549897ca866e6fba9be812765ed6c57c0c0

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