Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf9aed897d04a84…

MALICIOUS

PDF

95.4 KB Created: 2021-09-05 00:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a306e431f4fb3675704ad830a790243f SHA-1: 11ffa729f2a15ffd481e500d85f98db57ed25fbb SHA-256: 3bf9aed897d04a843ad8fbec68bdff85a161598a669db3dd832a54cbde2425ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=math+question+for+competitive+exam+pdf PDF link annotation
    • http://skncn.com/u/files/wijawuduje.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/j8qua0vtdph48cs6aij7hbi4r4/fasiwuv.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/74737830161.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/2u0hqeh6cjddjia634t7cpt492/dowat.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/56767831268.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608710452aa5a---mofebapiwesateguv.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/gojel.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/uk95sr844cgcrkfe69cstrihnh/bizudulejowi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e85e7961895---15162053353.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/nupaf.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1611159b64c3d3---bagotekefavukuta.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/48108567381.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/nulivukixobarozal.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/losajoguvuteviso.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/cb8b93a347f7e9b381de85b0a894b460/tuzopan.pdfIn PDF document text
    • https://tadimtursu.com/image/files/90804511636.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-7-29/20210729210247560842.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/i80kcc60ok5aic6816up3e59m3/7618220690.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/tifatiduxutaxolifum.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/gazotedovizame.pdfIn PDF document text
    • http://piecco.eu/upload/files/80117005219.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1e6a70c74d10a5bc2d5996d9e0c69bbc/vefazajasowegomifupal.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3037635786---wufadutakujaj.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/66889815679.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_off00010fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 11244 bytes
SHA-256: b46bb0cd9115618aa3df4dbdbf01cf03d9a07841fb241cedbf0be560c82d9e7a
font_02_sfnt_off000141e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E7 17744 bytes
SHA-256: 2e1c65568b53c4e16971a53876650e36a92b15a32294cc9f838bb11db5651d86

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