Malicious PDF — malware analysis report

Static analysis result for SHA-256 48bf46af72e02245…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 06:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4ec00881945d100db8cb4c1bc70da93c SHA-1: 104a735f4a4585ac9f1151308a4a06a7d25aaf41 SHA-256: 48bf46af72e022459d93476be8f783cea2023f2eddf7bf5bd61d12c99ee9dd03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is intended to facilitate initial access via spearphishing, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=handbook+of+medicinal+herbs+duke+pdf PDF link annotation
    • http://aostavet.it/userfiles/files/vobebavatowemiwebe.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/xofodakopesotanagus.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/9862440677.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/50b1e0a4282bff3b441867c22c0e9a10/tuduvifawajar.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/ruluwofipegavip.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bexowisoziw.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/e607b70a2e00447d8037d5bf29da47b4/32298248207.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/8d8c79fa837e378e9d59304387b11fe1/kegija.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea15970a2---kuwoxofi.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19bb00a7f1---wadikowi.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a6980bede059ea1804f9903e84646740/kavepebozawojexufufelok.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/26901611e8da227ef372609aad4b1f50/37833336967.pdfIn PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/66515456107.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/fotukiwijodamuwevu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/475c592fe648fa5a503ff09f31487078/pefukiliku.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82376285202.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gemujewoxur.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/jipomowakobod.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/xivuziwomaxakukenufalefa.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/muwivo.pdfIn PDF document text
    • http://guinyardfamilyreunion.com/clients/62985/File/28895489258.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/6013817528.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/desow.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/42884896039.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7147f0642---39392944420.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/baxudube.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_off0000df8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79C 19476 bytes
SHA-256: e1945b686c6070a5c261d9a4a405d5f7560fb9b35d38a47f0bd1c65ec16935f0
font_02_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 11112 bytes
SHA-256: 01a4324ff16f2e9922dd89d492babb28328b7b74eda2330cebd403552937d36c

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