Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbffaecc62553dea…

MALICIOUS

PDF

71.3 KB Created: 2021-09-25 22:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a668a25c819ea283c478159a8192b6a4 SHA-1: a7280c74d2239d2653e1966391d2b807a999b544 SHA-256: cbffaecc62553dea8d73b3afb29aa6f76e306efb69e81661c8e63a14e4f8d561
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Heuristics indicate it links to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent, likely involving the exploitation of a client-side vulnerability.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.jacenter.org/js/ckfinder/userfiles/files/16805206572.pdf In PDF document text
    • https://sysyanginguvenlik.com/uploads/files/degefapozebi.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/f86b8c35b08aa1531eb46662ddc640be.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/muvewusilewigipaworo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kg4hsv62n12bo02nofs5n1b4hk/78139493225.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/xomebuwewoza.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/38196614035.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/21601656755.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jalivavis.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zugirubetejakotukiramivir.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/budugupoji.pdfIn PDF document text
    • http://turnyras.lt/Files/file/37141680035.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c85dcb01d81149dc36b1df15945eeec5/fitejarusugodu.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/22644399615.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/7372931224.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/kulenegajogewavikurizolu.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/vugewufuxu.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/27814971939.pdfIn PDF document text
    • http://xn--80aer5aza.xn--7-4tbj3b.xn--p1ai/ckfinder/userfiles/files/90787570313.pdfIn PDF document text
    • http://idcla.net/upload/files/ribowowinivusefuresukuz.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/zomogoxuwox.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/833bc103c63110c75b7ba82bce304cc2/fixatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+notif+soundPDF 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_off0000b287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB287 18160 bytes
SHA-256: 700426c6e0b03050b79a2ef5a6cd989b422e2b68135b48153bd69adedf7c08ad
font_01_sfnt_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF997 10088 bytes
SHA-256: bd6034a033a643d6b7f6608e7862eee28a503c76280d6f8ac858203548261f9b

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