Malicious PDF — malware analysis report

Static analysis result for SHA-256 0be11423eed76306…

MALICIOUS

PDF

75.7 KB Created: 2021-09-02 12:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9969516587635b3fb3ee03e6a89a9dd4 SHA-1: babec53ca8490b2c7f172d107cb3c32df2e2d7f6 SHA-256: 0be11423eed76306ea012f69515e1644ca0d56dcba61b786dfe578a826c4a2ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and link farm nature suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://portamarioarchitetto.eu/userfiles/files/xidelimolegotu.pdf In PDF document text
    • https://muzeumkonstancina.pl/attachments/file/tasebuzabuzijo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/4c0be6ba35560dc3daef425ba80cd474/tugokos.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/41224661130.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084d411ec409---1486819039.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ef189b770551a8bf5ba908cac4527fcf/kinovutazisuxoli.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/89837166723.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/u7bpj5fmkcic8n0smeqf4lgpvp/51042249587.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/konepiruvizofa.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/dakunipiburupe.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c30b215ae4c---90074272801.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/53711688595.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/24594922512.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/4865aa6da8a7a646f4d5bea1396e0b30/kobem.pdfIn PDF document text
    • https://egca.fr/userfiles/file/najele.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074a8d58ffd3---kopunovijude.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/34782709054.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3qmo0742qkpsk58gqku05i32sh/tarotag.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5eb1d3512---jikudotikoteno.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076db72cb5ad---bagulipobevaxelor.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/68402199278.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160807d1d3c55f---kujafe.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/86624293310.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/57490103509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jbl+endurance+sprint+manual+espa%C3%B1olPDF 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_off0000c073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC073 17436 bytes
SHA-256: 0ec3d0156a5443ab3e10bbe8b3b54490b05c8b1d7b31fc80be9ff390af393d31
font_01_sfnt_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 11112 bytes
SHA-256: b9678ecf29b83651107be681e616447581153c9a16dec3c03da8efae5e820bf4
font_02_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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