Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f7c8796e4930ae…

MALICIOUS

PDF

86.5 KB Created: 2021-10-08 14:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 855c8ed3fc78bc19069834215d1b8231 SHA-1: ba4144e250bc463a5eb065715a3ead8c59dc1b2f SHA-256: 76f7c8796e4930aeca8029c49c99bee5b6755db9facdd05bd8ee1ccc3ca09b4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting it's used for phishing or SEO spam. The PDF's structure and embedded URLs are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://drafthe.ru/uplcv?utm_term=news+rss+feed PDF link annotation
    • https://podgoricki-klub.me/userfiles/file/26893824676.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/mejul.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16141d2ca61762---40837042036.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6155a3464---jugawidikuforinupiwe.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/tidumebalafajafurune.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/48472117031.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/85604752843.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/87555497730.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/13014356963.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/jomadurifisifelupofevuba.pdfIn PDF document text
    • http://dges.in/userfiles/file/18933510395.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c6b7afe01fe38244773a410e79170217/99006789839.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/lumej.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d72330bf34---metowetevokaxusened.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/87081749750.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/selerigipotisaga.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/70508853529.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16149646c78f47---35610745915.pdfIn PDF document text
    • https://paperland.bg/uploads/file/55632804822.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/50018580824.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/negevekanezovomivugugobob.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/bd6086423a18198056f012666bad3d2c/72077437375.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/fadujegijovagunuka.pdfIn PDF document text
    • http://gfk-schwimmbad.de/i/File/lofewoziduvat.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/66936769077.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/89926187244.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/14464751198.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_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 9788 bytes
SHA-256: 0b08f46d426f1b7d4893cea30bd4943ef999076f9cf2dd03d5b463891b234c8e
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 19072 bytes
SHA-256: d74cd8eb85fe9c95810d48e3c1c0bf418b1de063de3b30c78d3949a1d6dfaca5

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