Malicious PDF — malware analysis report

Static analysis result for SHA-256 f57246e4f616feb5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 08:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2fb7c31616dfa2badca8d6d637b226a7 SHA-1: 96c0d377d6eb65a2ec7abf1cc90e7daf7a962b08 SHA-256: f57246e4f616feb5c51e01dbc9989566e61edfbcac1112b949dfdc12c7f67470
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, suggesting an attempt to distribute malicious files. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://biosystech.com/pdsFck/file/97404534467.pdf In PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/33839197753.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/374724f10179b3d7a2e8832c60616452/ziwazisejazasorarijuvomet.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/23egj3o35ofmtlu5bmfa1r503t/89514274202.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c60b277e639---99391891874.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/26323969535.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/3e8805222d682249d2f091531078c24d/lovujewamofu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vq4hmahabfdo9q0mhkflpau8v5/duwelibinetavunojowaduz.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/qihksc93a34k5f4u9g4th3e7jc/74576002523.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/3329335242.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/finavusivinofa.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/78231610255.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/jp77i69ioa8gjae60nbm2bs5i3/58201215203.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e90eec18a98---mubix.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/411db0547e6182462d8f6d57c9419129/43167903433.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/kefq1af3er8mo635e1q91o31q0/11509462550.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210529033852.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad592639cdf---18056667464.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210609125212.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/firanelesoletu.pdfIn PDF document text
    • https://malikcolsys.com/userfiles/files/3290807557.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/13557871605.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/5bb99a6ddf684ac88d32ce74d64c6663/40909856904.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///fogivubokipenivolimosoked.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/jagoro.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/51255226308.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a46d016357d---52402203768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=convertir+powerpoint+a+pdf+gratis+onlinePDF link annotation
    • 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_off0000dbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10856 bytes
SHA-256: a8911e17151045c599f7507b5a193d2308b2d6de9ad334f1ce5f2c75a6e71740
font_02_sfnt_off00010d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 17216 bytes
SHA-256: 037872e51894b347490918eb49c12ab057b7ed205f5810da71952ad2df5c21b5

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