Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfec301be8fa7ea2…

MALICIOUS

PDF

83.4 KB Created: 2021-09-09 11:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 30c8216bcc9168529c443a62d298c789 SHA-1: 2443444a27e45b9d19a2b484c97bb3a7dd8bd4c7 SHA-256: cfec301be8fa7ea2e5b88e6b68f923b45416b00541c5c7f09e3dc9d0b6098d8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://irlanc.ru/uplcv?utm_term=best+game+streaming+for+android PDF link annotation
    • https://netshopnepal.com/userfiles/file/24683344151.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905203319843175.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/72262941113.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/48500142117.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/fozipuve.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/tinipemebefi.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/53980034191.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/15112407171.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138875bcf0f0---maguxusirozogoxibejamas.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/87198917101.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/dojabizavibifomizini.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613061641f938---jodudukag.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/lodomuvixopujowesokaxexud.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/71901265094.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/2eb63d92929b5c7f001a6fd5a06ad7d6/45188544291.pdfIn PDF document text
    • https://apra.pl/files/file/41741166278.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/b9avft3u7v9hakjno4d28e5apa/7938763757.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/kerola.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/kofituvuvaneniwurojotip.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/94796777925.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/jigovanufimepubisiwan.pdfIn PDF document text
    • http://suurelepa.ee/data/file/25570577799.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319028dee0b---liponabuluzerop.pdfIn PDF document text
    • http://kdekdyjak.cz/data/nomugidowowefobimorugorit.pdfIn PDF document text
    • https://vili-al.com/uploads/wysiwyg/files/20906328952.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613037d78fdd2---rufafevudagudos.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/16384404944.pdfIn PDF document text
    • 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_off0000e252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE252 17404 bytes
SHA-256: 5bbe8f74deec28114e885b5b9cd8a285d038b8416820fa5ead2e96786dee2b51
font_01_sfnt_off00010f1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 10704 bytes
SHA-256: 12b08cf9c4238c672f42623701191b22b7c5fa133f0ab304cc780684602839b2
font_02_sfnt_off00012782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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