Malicious PDF — malware analysis report

Static analysis result for SHA-256 671251a2978f5a00…

MALICIOUS

PDF

89.9 KB Created: 2021-07-13 19:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: eb4f3e5f9e199e0ddf26ac68c8ce2895 SHA-1: ac9b437b0ecfcb3ee834d8f91bd43d2bfbed3700 SHA-256: 671251a2978f5a00b40432d4a53d561128354b1eab538193ff24d542b2be71bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links form a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=dragon+ball+online+download+game PDF link annotation
    • http://nuestratierrapremios.com/campannas/file/79539736885.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/xuxizorudaliwipu.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/jefutodulojasew.pdfIn PDF document text
    • https://gilbertems.com/videos/file/vavajorimoxiv.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/57960143699.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/0fa44a8c3f1d079646375fa8db543771/kukutevukepikimegimadexo.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/barefoj.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/smfj42a1mi759pouii027f61rb/nemukiganizanitaw.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pixejobepumabakivavu.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/25354509492.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/rigetedamifagakimoxake.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/22697764646.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/kapumavazeno.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/xiniradej.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/xijozunamenalopifiwegago.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/77800300034.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098375915632---jivan.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/zurakilako.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b7242ff11ef---fuxezulelabupezikajogaje.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079613b3b8ed---7647554199.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607db8e781768---54373164041.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0da9a647d---28667532586.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/fuzikileruxop.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081808539213---33063046467.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b8b6cf429---21372166423.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df0b7f07376---6922996385.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_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 17768 bytes
SHA-256: 03baf06c4d29144f5e7aa7bfde502d7d66c744becabff6e11c4f95ffc8b9c239
font_02_sfnt_off0001426a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1426A 10552 bytes
SHA-256: c4c03089647cf0745ff241a92fb08b9b95e017b2e02bd316bed392683625f05b