Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d5c797f7a59100…

MALICIOUS

PDF

89.7 KB Created: 2021-08-17 14:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9a584231646f12b0254a16d9a1c1667d SHA-1: 2cadaa055f0c91d559ef44e424bceab74dabec17 SHA-256: 76d5c797f7a59100e0f4287f944a04c2facfeb337931fb281a10e289c4da5c01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=is+totally+accurate+battle+simulator+free+on+ps4
    • http://electrogalicia.com/electrogalicia/recursos/archivos/44662480200.pdf
    • http://poltinka.ru/userfiles/file/23656663106.pdf
    • https://elsadaulte.com/ckfinder/userfiles/files/xowikigarubesufuk.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883f3475cc1---dizozopedawudutimiluw.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-30/20210630083414498831.pdf
    • http://oxigensupplies.com/shipinc/userfiles/files/2768828252.pdf
    • https://benqmusicworkshop.com/fupload/file/jivexemigim.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8504ece74307ca52afb692c298e971ca/23805093038.pdf
    • https://vansuloi.com/uploads/userfiles/file/35545338594.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/cc1985f11a1e1b870b4366184fab8dc9/kukemexetepubaputumonuba.pdf
    • https://voyageaventurenepal.com/upload/files/kerorugijejuvubexob.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0dda02471453fe282c1632aff3354cc/72336963844.pdf
    • http://prochem.vn/images/uploads/files/93524068339.pdf
    • https://bloomeng.com/uploads/rolobizopupo.pdf
    • http://giasudaihocsupham.com/Images_upload/files/48712600187.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611b18938ee55---dafakiganawularolevixe.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/wojodezekabaguxorugupawo.pdf
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/7qo1se3o6bdc0579dsc5lin4gi/88081224516.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/a50c0d178a018edce66bd39fe66ef807/dosifizula.pdf
    • http://seabeachthailand.com/UserFiles/file/48765946620.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0022bbb3b0---73870829478.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b54576b04---pulefefufivekisidupesix.pdf
    • http://cnex.cc/images/blog//file/57531133998.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090ffa31e31c---vetofuvisilazaxev.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e1.bin
249fb6b30d7420adfea70eacad9cd05c2362893ccef2b07b2c27897a53f2c5cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 11024 bytes
font_01_sfnt_off0000fa63.bin
262cf985a59d4bbe638f60285f93659ad01115974730fcf16162a36f6ead7b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 16780 bytes
font_02_sfnt_off000111a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x111A0 16792 bytes
font_03_sfnt_off000129b2.bin
5524305c849313b462362bd24706f5aeadcdd7dd8c79c1a6b83be3ea395f80b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x129B2 17700 bytes