Malicious PDF — malware analysis report

Static analysis result for SHA-256 54986cd4568ce5d6…

MALICIOUS

PDF

79.2 KB Created: 2021-10-05 03:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d0e74734a356f0a4d39279850fe0ea4 SHA-1: 3c13453c7f1570cea49e8e1202145bb808ed1147 SHA-256: 54986cd4568ce5d6f4585159c2ced2689c2eb2118add7c882633b95273c0e73d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and heuristic firings suggest it's designed to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://thekitchendesignstudio.org/uploads/files/pudedo.pdf In PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/62185919909.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/50948256254.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161418f7830256---93828692730.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/nosiwanukodifidoz.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/kokedadotujekijiwuv.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/kuzaxabudakoju.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/51646519454.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/42273854622.pdfIn PDF document text
    • http://ccshecea.org/upload/files/17243324036.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/ragosezuwuti.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/50094819873.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/21759986165.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/lituvamel.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae51e1b7a5---vetuvagurovaborixotabemus.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091417592680554.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/jijowamapabamujevofetaf.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cf1a4628adc2185499d3f7f474681270/ripeva.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/mufufironumazizugupufir.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/792533295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=art+and+object+auctionPDF 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_off0000d003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD003 18352 bytes
SHA-256: 6c09848a826da8d3815cd414b1bbb9b67a6a85a2a75663cd766258d7e9dcd113
font_01_sfnt_off0000fff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF7 10500 bytes
SHA-256: d3b410e88bb4b2373a2ee2f6d330964798e96850a5d2f01286ebe35bdadc4fec
font_02_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1