Malicious PDF — malware analysis report

Static analysis result for SHA-256 84d611e7dc9d08a2…

MALICIOUS

PDF

83.9 KB Created: 2021-08-18 07:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 703bcfd2d0ea2770015cfb9cead9c950 SHA-1: ddaf6b266cbfcab716b2ea55c50376ee8de01bbc SHA-256: 84d611e7dc9d08a20cf7b9e1bf25b8ef72399f20556928589e1a0a47606258d1
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains a link farm pointing to compromised WordPress sites, likely intended to redirect users to download a secondary payload. The document body, though heavily obfuscated, suggests an invoice or payment context, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=how+to+create+a+check+register+in+google+sheets PDF link annotation
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/ad68b51ed3d105a032265ae264a0bf2f/majituridaj.pdfIn PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/12771222739.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/30153130913.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/84110215791.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/17b43cc84e3fbdf36cbababc3058d39f/56166345424.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/bd6f70feabe2e5efaee5897c5f0d63b1/49959385308.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a43b8dee19---momor.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961157afa84---ruxesikutakimuvufofej.pdfIn PDF document text
    • https://webmenuplus.com/images/file/volikusuwajakoxejamena.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/1dkd1viooaf94bgrpm3o5obuot/69104424059.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b891041dab7---losotujowuxaneluli.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/78408346698.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725ac9dcbc7---wuwimutuduwetavarote.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/24484845581.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/49626033856.pdfIn PDF document text
    • https://everestart.com/images/stories/file/kegokajedisutezekivibib.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/rapako.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090dcc98b5cc---xerowawufuwaruwefoxiv.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2682371c89---17576852229.pdfIn PDF document text
    • http://asr-net.ru/uploads/files/nekafub.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d1aef912---23338066925.pdfIn PDF document text
    • https://starbox.fr/img/files/robisisivevutuwopes.pdfIn PDF document text
    • https://maribon.net/app/webroot/files/userfiles/files/govirozoda.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/42061193875.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/66315951443.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c2c5e6db4b---pofutubu.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_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 16848 bytes
SHA-256: 02fa72fb1a6522f446e724a84f5f0e4c1869b857f31cee7786f802f55c328cca
font_01_sfnt_off000110b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B2 10676 bytes
SHA-256: 5dc32592d04f5c4bc297cb09495acf9827afdf9355fd6da556a47f92036e659a
font_02_sfnt_off00012924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.