Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ea969a067da94b0…

MALICIOUS

PDF

80.3 KB Created: 2021-09-08 02:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 085ccf50b6f1872d696a06aca412ebee SHA-1: b8d2a3df181613d053dc90fdc6535f59ab0156fa SHA-256: 1ea969a067da94b0a2b610afdd6cc5ea040f636421fb5e00beb487251b6b8ada
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm nature are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • 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://okinawa4d.com/contents//files/bobalikudabesuli.pdf In PDF document text
    • http://rcp-ranstadt.us/files/jofomez.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/58m1jpda0fb711dmakolbgbmbj/61524502116.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp//files/nenaterasipatenul.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/d110f1edacb77842a067b16ce0d326a0/9893927211.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/64803152181.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/87274629607.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/xavunizowekologitaga.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/16553498411.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/barumiko.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab69337a85---346247864.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/66789183523.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/ditaw.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1520950328609b99520f008.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/db51d9d206b7df5588183c164098d0bd/53438629525.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b53c791b---fozomajojifilegixel.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/ferinusapirebojuturo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f4503a56a---jitumigetinozebilujogi.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/tariripemofupakeziwagebub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607defa8d69cf---kevotoxuwaxilijabapib.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/62203744888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+handwriting+worksheets+for+kindergartenPDF 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_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 17324 bytes
SHA-256: 2969263336622d5e04d7a30253fd1b252e02f1dd694bab5661b2531a289bea51
font_01_sfnt_off0001029b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029B 10740 bytes
SHA-256: 7dfeece3b405949149d5264c13d76d4a42743f15d146d30b03748487c76623f5
font_02_sfnt_off00011b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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