Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc87fe8dc6bb857…

MALICIOUS

PDF

73.1 KB Created: 2021-09-30 21:13:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3cf3bdb2f134da68157f83f4334ccbf6 SHA-1: 21ba3c848fd746561267c1443d48db13a2141754 SHA-256: 6bc87fe8dc6bb85778107d0b5ab0d76a13d9c44b85f3a4eefb2f23fc0df1b363
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.bnbtravels.com/ckfinder/userfiles/files/junukokopumaxof.pdf In PDF document text
    • https://parlagame.net/calisma2/files/uploads/97521584953.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f5bb3dc0f---69995743698.pdfIn PDF document text
    • http://viorina-deko.com/images/file/67989086755.pdfIn PDF document text
    • http://novafish.it/userfiles/files/10516729744.pdfIn PDF document text
    • http://cga82.com/admin/File/97137809521.pdfIn PDF document text
    • https://kopari.hu/files/file/sebovovileso.pdfIn PDF document text
    • http://geodez.com/pliki/file/33835153823.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/adki5vla4oqs7teouv44rbtrd8/87046756956.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/37253973720.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219281926349731.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323c1b106a8---pizupopepubukular.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/99130974264.pdfIn PDF document text
    • http://sartor.ru/upload/files/28337794045.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/22916664203.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/tamijeserowewokigapofux.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/75276891607.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/94462145580.pdfIn PDF document text
    • https://rjpexport.com/files/33263336160.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/64523906477.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/96831876865.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/46356232983.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/41087953155.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/11445133136.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/40895769069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+draw+on+imagePDF 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_off0000b5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DE 10344 bytes
SHA-256: 675f8cb978ff3d5821f127a43b0a5ae0bb1a1c23299d6d2c5139201739ba6f39
font_01_sfnt_off0000cd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 19348 bytes
SHA-256: fb165ba9c8b4cb12515e3fabf6797cef4cc4d94eee47f4a2d3c9c6aa34cdb23c
font_02_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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