Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58def203149e2a6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-15 15:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f14497f22b65943d188afe53320c18b9 SHA-1: 85001c5b9b8c1705840e4ed16161ac2a26e2533f SHA-256: e58def203149e2a61ff3a432b15da081c58f8f0350b4ffb1893cad67ee9a5682
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on potentially compromised or disposable domains. The document body is unreadable, but the overall structure and URL targets suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.cenlafilm.com/siteuploads/editorimg/file/zozizederifanewa.pdf In PDF document text
    • http://ccsl.asia/files/boribiwadud.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/83077123283.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/denenolidizapofisuba.pdfIn PDF document text
    • http://mgbig.com/upload_fck/file/2021-9-13/20210913063339988896.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/2b9f348f7785c5cad75e005eb1d43bdb/pesogoz.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/85762052582.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/gibinu.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/tapisigiful.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/jusojuxubinuwopu.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/buwesi.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/xarafuwowilobelij.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/38119664022.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/87356418993.pdfIn PDF document text
    • http://nhadeptannguyen.com/uploads/files/32966338475.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea20478cdb---vaviwadimofotir.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9dab8d37d40105065b4ecf3b2953715a/16981030309.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352df344391---giwazefusenatarowurubegax.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/8257332482.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/16636151606.pdfIn PDF document text
    • https://nomortiga.com/contents/files/40947217013.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/46555107155.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d7096f38d---pojabevuzulam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=add+text+to+gif+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_off0000dd53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 17916 bytes
SHA-256: 96f7954e06b11601f5eac26b549b3b4477dc85f41f8f3614daf244919cf620fa
font_02_sfnt_off0001232d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232D 10400 bytes
SHA-256: 596d53f6387a4f60869a96fe148f718c97372abcc1d60603b2ddd0a4e1a2bc08

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