Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18cf6005c2f7672…

MALICIOUS

PDF

109.9 KB Created: 2021-07-31 08:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d349a2e6641e10eae26e999b598fb87f SHA-1: 47f88f238740ce5a03822728f52dfc9af0a40e21 SHA-256: a18cf6005c2f76722847677dccd1810e9d9b460b19a4370a2d3f0c992bf948d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage malware or facilitate phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=a+orillas+del+rio+piedra+me+sente+y+llore+pelicula+completa PDF link annotation
    • http://mopron.ru/upload/files/lilumak.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/3h6o78p8spk4hthmb5f3oo38p1/10894955127.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/85d0ed0d3ec8960e03a01ff87287c0be/setuwisubalagizivij.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160d81751d324c---wutekimagugo.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/bbaa4154f22947203b7e2549487cfc73/wogeriw.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/16934134143.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/4d5351de46733aad810ec2043d122f78/dabuxufoditun.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/41773180964.pdfIn PDF document text
    • http://englishplanet.info/ckfinder/userfiles/files/pawojiwipaguri.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/95802749119.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/posuzetomujezisoga.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/nekejav.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/kubapunimebasatifigaxes.pdfIn PDF document text
    • https://altbuket.ru/files/79918555803.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f65ac6d423f4efd49eefe2118f83f135/dajexilokebojidenetu.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/guwuguza.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b643ed35cad---20911283359.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/12567874598.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1120723c68162901d68298cf7c8603a8/30752041912.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/8b4a56ee11b50e4d554c482b7876a63f/66713755461.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f837a030d4---kelasedadalusoda.pdfIn PDF document text
    • http://short-story.ru/upload/file/xodoruvijo.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_off000143d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D0 19456 bytes
SHA-256: 96b92035761d0832846a9469a76b29b7fd62fe6c154292a8638e42271b1a26ff
font_01_sfnt_off0001765c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1765C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E73 10872 bytes
SHA-256: 497e58ac01c05308b32c513427796f082753802dd0a9012a9d636b9c1e0c86c4

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