Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f0e35b6b1abe83…

MALICIOUS

PDF

70.4 KB Created: 2021-10-07 04:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8fa11c9ff4ffe9058b273153d73a1cb5 SHA-1: 3eca188ca48a3246da0a2255e3e1e73585b4a475 SHA-256: 79f0e35b6b1abe83c33933b938177f12440e9eae4795bbbee447be3213938f9a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on potentially untrustworthy domains, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://accessiblevehicleservices.com/userfiles/file/suxewavotagukibudegoxade.pdf In PDF document text
    • http://nwatchonline.net/userfiles/file/leloxajadad.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/vedadugabexedo.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/39944479967.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/4040648775.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/55241499433.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/68184025175.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210918041021.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/79140602272.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/sokibiwiloxakowesosopob.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/4cb5e977944a9b69e319ca6af632de8f/mofolinuwapixupo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f019748624---15277363775.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/tutute.pdfIn PDF document text
    • http://rapet.hu/files/kowivapogu.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/toxudurulugebizuluguga.pdfIn PDF document text
    • http://salondebellezaanamariaromero.es/ckfinder/userfiles/files/nijasedikuxefaz.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/fabotojarumefemexus.pdfIn PDF document text
    • http://www.77ice.com/upload/files/wujuliwugunewelidofarewe.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/10718980070.pdfIn PDF document text
    • http://tulga.ru/editor/files/49851122589.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a485567253---31795324765.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/fujubovimumizumijapem.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/zosevojuto.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/88886342868.pdfIn PDF document text
    • https://ms01bet.net/contents/files/musolizobonide.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/58908127699.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=rotter+incomplete+sentence+blank+college+form+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_off0000b56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56D 14640 bytes
SHA-256: b6c03795e4c04685e439fb886604f8f986ae6302274c311a12c92f31be7fa6b1
font_01_sfnt_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 11240 bytes
SHA-256: 4c36102b38b5bb4d158a017acb8accc5c62bc378a400d2d71e7da8a9b56e4af5
font_02_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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