Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57e9cceec8d4c51…

MALICIOUS

PDF

71.9 KB Created: 2021-10-01 13:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3c63dded65d7d05cda7adc7358469591 SHA-1: 63004624c380c3a3fc9bc5f1edb1c1b5a4aabd76 SHA-256: f57e9cceec8d4c51950fb6c0b6d5a67e655c2d205badc0750a8d6db14565f404
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=pokemon+heartgold+randomizer+rom PDF link annotation
    • http://syntrend.critical.tw/upload/files/zakidizonut.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ad469ccf5---69356567663.pdfIn PDF document text
    • http://eternaseguros.net/files/files/95111625122.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161356d70e295b---bakivupamawopoditoge.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/28525808212.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614b4a80afdca---pazunotiresigukufepulufu.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/96134319862.pdfIn PDF document text
    • https://xuongkhopbadinh.vn/images/files/vigugawogobidovagiwerexap.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/firajiginijinilejuzako.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136ae3527f05---97798441665.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614da0331344c---korusujux.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/46902458446.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/94571077955.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/73937643099.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/76526483518.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/nidazuxesuveloxudufozasis.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///49304764344.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/13452150302.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6717f8cc7b9807b7c0ff372a1d5daade/55593514703.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/zofojosazevabexum.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/33910076533.pdfIn PDF document text
    • http://matrixpaint.com/ckfinder/userfiles/files/nedefasebefelimidevuzu.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_off0000b55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55E 10680 bytes
SHA-256: 7e1eca8b013e49ad39583fa82c6cfc0237ad67194aa1a38ace55b955323b347b
font_01_sfnt_off0000cd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6F 17276 bytes
SHA-256: 1011cf379b1efae4031d25a0486d60a05293b282dd7ca0a5327c575206006ce2
font_02_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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