Malicious PDF — malware analysis report

Static analysis result for SHA-256 109e6063b4e583e0…

MALICIOUS

PDF

86.9 KB Created: 2021-09-18 00:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10c4ba2971043d19db7c793088622cc1 SHA-1: 768cf40f44c7c8bdc71e96bb5c0b465a40952b10 SHA-256: 109e6063b4e583e0ee10d563585b1ac3b4b47ab2d8fc01f31515393b578fb74a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external sites, many of which are hosted on compromised CMS platforms or disposable domains. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=dungeons+and+dragons+manual+pdf PDF link annotation
    • http://didopack.com/files/61451068700.pdfIn PDF document text
    • http://4bx.pl/public/file/pifakolutuzutagefibikulun.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/gunanidekow.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/35605236527.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/pq9agg6m96rut54a355quvetgl/bifuradig.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/16999637991.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/rmsiphdgu1gvd9qkqmb9jacri7/12644900952.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15973207139.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/fobozosagitabo.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/36483035462.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161445dc7cdc12---lulolajewikiji.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qavkbfgv9do4balllbumtasvup/69095389371.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/c31b4ccec99b51d934cbe2eba0a3fe0a/24777861818.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/35385565583.pdfIn PDF document text
    • http://precisao.org/files/files/milapaduwoz.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d7e58078---foxezudozidid.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/4902179811.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/nejafotit.pdfIn PDF document text
    • http://guchen.ru/d/files/8650362790.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/latamatukorazawo.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/35347290996.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/65032217738.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/vokeriwug.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_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BE 18388 bytes
SHA-256: 529f9181d1d5360849ab8317339be2b5aad0ab7bfcb9dbb890f97bf400e8b312
font_02_sfnt_off00013524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13524 10752 bytes
SHA-256: c195fd07f3219229189ffe70188fe9dc1b33b29455700b6980c13a1b364e4f75