Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45df4a028db818e…

MALICIOUS

PDF

80.4 KB Created: 2021-09-08 08:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e3fed25394bf2ce82315db4412ebc4e7 SHA-1: 9b338969f6700891cb06010fb22ca46993c8168a SHA-256: d45df4a028db818e82f6ccbd2fbd17b3aa211c1f4b0d4742b5843adf02fccf0d
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 exploiting PDF vulnerabilities or delivering malicious content. Heuristics indicate that the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5f17f6ae1d---12994934489.pdf In PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd0da33dd4---wirozesedaguzakuresabebi.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00d878349---gegivananovixuzo.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/69765716845.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160984c1c2480c---63587091504.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/lurunizefarupama.pdfIn PDF document text
    • http://anupbolivia.com/images/files/85442431071.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/c9c3a008fc5086049ed5e02a20586b8e/xejuvewezixizetiwogonexe.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/leldfqndel14fdm02ugsj0sh33/63822120595.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/9554954964.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160949177e500a---jufesidalosijikomukubeno.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/67192887838.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/64752492181.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3feb3ad655ef55d6f348da9ed023c971/nagapekibejale.pdfIn PDF document text
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/fujinofepilagosibasaj.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607694a510843---rumagilotapufin.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/870788688.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/49dd1f0f4f81c02ab69b8b041480b752/6639640545.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/35041272644.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/25072320789.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/fevusesabojiwalusejufil.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/nanige.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/13875350813.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=librosa+tutorial+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_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 17592 bytes
SHA-256: f9c7bdcc0a843cd51a3f7aa8cbe16e7bff9e08453471664053b6932935ae5f1b
font_02_sfnt_off00011ca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA2 10452 bytes
SHA-256: 86a396f39e698bf8e2ba057750c7bde8c96240d33fb8d86c0606a9cc75417405

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