Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c51c95758519949…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 03:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67a11d10ce3b55cf44ea7a7b38dbaab2 SHA-1: 0f3eb00fd7747837e24d5de8e81b30369a2682ed SHA-256: 2c51c95758519949abb4ef6286a47061bfd7b978ccc24b7a1674b987ba65d589
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains, likely to lure users into downloading further malware or engaging in phishing activities. Although no scripts were explicitly extracted, the PDF structure and embedded URIs strongly suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6686

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=noun+phrase+example+sentences+pdf PDF link annotation
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16100e663d0b6f---disizumivenufaga.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kajimegasafotinevitu.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/xogulipe.pdfIn PDF document text
    • http://centronegozi.com/public/julusemoporekixosinexuzol.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/20930729448.pdfIn PDF document text
    • http://mega.kz/media/upload/files/salidoninezukewil.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8c8ea6553---vevizipifakusinemisuzex.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c62d7670ea9---49635299960.pdfIn PDF document text
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/26348126275.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160851382acaf7---78605315275.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/34011657688.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/pabidozoresiliweroli.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/47748420269.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/33d009f7486f15a179e6cf362f444489/tifatexujogiz.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210712212455.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/vamikarusoki.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ed21733dc---bokoraka.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f7196042---bawinedanosorizoke.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/720351278.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/pepewawedomabaf.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/ropedeb.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/12140341083.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/fonosiwijus.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/5v9qbv94vrmpq1t4cr4s8uujge/45924031980.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f14da0c2339---zikarevar.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E4 18804 bytes
SHA-256: f94f953ca5e62791f80686091b286a7a122594b204f41a7df8fa263c26720e3e