Malicious PDF — malware analysis report

Static analysis result for SHA-256 f658686034aa251c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 18:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75156f2ccd38f08545bba2eb9b588cf0 SHA-1: b63799644d67d1d8db16357a41bab4660416e42f SHA-256: f658686034aa251cfb5bd0bdaded58be80b2683376ead1e2cc0fa60a16551686
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ballarioarchitetti.eu/userfiles/files/18134574729.pdf In PDF document text
    • https://coffeetuanvang.com/Images_upload/files/66043431187.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/44s6novc8nnk73kmd0m0bvj8nd/podetuvigejudurotovosuva.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///92287064683.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///gilazuvosuburo.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/gisaxevudefa.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/1919109226.pdfIn PDF document text
    • http://namlinhchivietnam.net/userfiles/image/file/popolitixiw.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/rujanu.pdfIn PDF document text
    • http://dungcumaymoc.com/Images_upload/files/38492043456.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449551bc6f6---93575745723.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/molobosebekalo.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/budamuj.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/75201952192.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/riwebatogupirilenurozu.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/40844462393.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///fenoxabisitiwegomese.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/doluxotupi.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/pikawejizezufigimes.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210915_021221.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/kujonarene.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408794df4aa---67071869496.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/katuwuresomutuv.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f674072b27---18539569594.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/420b0ec0aba55f6778ce731587cc046b/16684511843.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=advertising+and+promotion+belch+11th+edition+pdfPDF 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_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44D 19044 bytes
SHA-256: a89fbc402b041259d945bf56c759e9b4992a5ed16072671765ded3eafe96ea56
font_02_sfnt_off000125dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DD 11308 bytes
SHA-256: d5bf115fc2e5a3e70d6d2229e9924a10770d459e508a7e3d6090e32f1f2693f2

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