Malicious PDF — malware analysis report

Static analysis result for SHA-256 00d33ce731d1ed2c…

MALICIOUS

PDF

86.9 KB Created: 2021-09-09 02:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a4b6f1ddd59a934b17f137231f78f0f SHA-1: 45d9ca436d23fc96910cd74c18be671747f18e83 SHA-256: 00d33ce731d1ed2cac54318a024814b636192faebc6272b092b5ebeb89b9c74d
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The document contains a link farm with numerous URLs, several of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The presence of these links suggests the primary purpose is to lure users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://odontologosmalca.com/images/userfiles/file/xumekumudosamipadalexopa.pdf In PDF document text
    • https://phm.vn/upload/files/revox.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/matokera.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/72885616435.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/rafukugopokopugem.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/2109020038410921340gemm.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378d3e350e0---lagowizigefasuter.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/4b1101b8038e2ebc370cdf6c12ffbf9a/xizezerufimowopesal.pdfIn PDF document text
    • http://standdominica.org/files/files/41455583260.pdfIn PDF document text
    • https://tepihtrava.rs/files/54178705383.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/54023969105.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/gumabodajobele.pdfIn PDF document text
    • http://kccmaul.com/files/files/gakojixisusanipukumebiz.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/jatezuwuvaxikinafu.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/85765415344.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202109052216323242.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog/file/63549154030.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/dijelake.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/308627271aa1410265dbfb57299dca0f/82523584652.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/89840700224.pdfIn PDF document text
    • http://kmsenior.org/file/files/79930841638.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1b4413b6---83133917942.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/sixivixoxeze.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8clcbusej1a5pcq4o8k96us521/zunurased.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/kobulefanowevuximamin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=come+scaricare+una+suoneria+su+androidPDF 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_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 17800 bytes
SHA-256: 41a9ccc21790a2227c8fddc64d714f181b51e56968e81eedc919b5134667d2cc
font_01_sfnt_off00011e03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001361a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361A 10520 bytes
SHA-256: f7aa52b1564ef0ddd9e8520665cb49869bc96f2f0c4872edddea2488624a0717

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