Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7c36fbab4dc2e8…

MALICIOUS

PDF

104.2 KB Created: 2021-09-06 12:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92454a5f931e27dff4a293482bec61e4 SHA-1: ad363552eed73e484ce02edfee00ff987b775172 SHA-256: ca7c36fbab4dc2e8c6b662368ad63fa8b93b6f01b4fccf0f61ea5cec1761760d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is designed to host a farm of links pointing to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://smidgel.ru/uplcv?utm_term=anomalia+del+agua+pdf PDF link annotation
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77035f08e9---waseda.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1285c98b0---16776890134.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/pugabisuvof.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/18990742004.pdfIn PDF document text
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/fozijiseta.pdfIn PDF document text
    • http://archiprojektai.lt/app/webroot/uploads/userfiles/files/29742036196.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc71b74c78---laboxivamotopudir.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/nufekilamopawexari.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/103marnef477m1vp6c5s5uctkl/78794015778.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098b6420291e---fuxifoli.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/durijoxajuxorapujar.pdfIn PDF document text
    • http://enricobarraco.com/files/64679186091.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/lekiv.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608163b717b59---61398099730.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4t723ahqmdeh0uunvcp36sdru0/69005648930.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/gazireduvujabawaguxaf.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/jonewilonapajisesu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0a51209a51439aead9528232137ab5c4/22285401739.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/d08f7d80dd8a5c2c4ed16f89b9b75b07/vitoribe.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160e57712e77ba---kifofemidoxidorizuzetugep.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45000dca3e---tedidugekek.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607346cdb02f5---99308356876.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/12040507561.pdfIn PDF document text
    • https://kildevangen.dk/files/55776160648.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_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 10556 bytes
SHA-256: 061302b9a9da88f25f4c1e3a4d3887dc94d40763cd18231e5bf647711587af85
font_01_sfnt_off00014404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14404 21888 bytes
SHA-256: ada55e369284898eed3c8667a9553070999dcaf569e332923d6f24990e14006e
font_02_sfnt_off00017b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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