Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1f335cf396892c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-10 12:17:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0290d36e0bc0e535b40fb689931a28d SHA-1: b0ef5d7edb0df01384c59fcacae644e079e10f88 SHA-256: 9f1f335cf396892c81df824eabccbcc30ba565922f33ed97c045b5ac3a21891b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the structure and URL patterns suggest a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e3770e23995e1cac014d11a425faa957/limixenoborore.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f6ca1af8---5594074914.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/xoribedazexululupulowa.pdfIn PDF document text
    • http://dhf-china.com/d/files/pumowexugitonadasuwukajo.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69551775755.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/jatukezevubatitim.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/49558075794.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/tejewuxut.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/sovufasazoziwobenip.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613440d320905---rideduxurewinapiwo.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/26302058308.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/petitawowebafurutuditamex.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/01/97042097835.pdfIn PDF document text
    • https://noventa.cz/media/files/file/82561379027.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/woxizonezogavi.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/62613861835.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/71982974769.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/7314828400.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/36559504775.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/mudaduwufeguguvi.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/wawezoxivov.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133abd5a479b---zopovujuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=clash+of+clans+ye%C5%9Fil+ta%C5%9F+hilesi+apk+indirPDF 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_off0000e961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10173 19060 bytes
SHA-256: 2722ecc8cf6f64ebafca469160e5b2eb807823046f56c7f65db43dc1eda67dfa
font_02_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 11196 bytes
SHA-256: 96b881376cacfbcdbd3bd330716f8f91289ceb279b245c5fd29ed59ba6051e46