Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd5b2516a82f0f01…

MALICIOUS

PDF

95.2 KB Created: 2021-09-08 10:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fd3b2ba45ac386c622afdb1868eadc17 SHA-1: e0cec62801f1c664c31a74394464e383b953b620 SHA-256: bd5b2516a82f0f01d2f13314bd26f5df4e35eec15f053f1936824f63274f5495
156 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 numerous links to external sites, many hosted on compromised CMS uploads, suggesting a link farm designed to distribute malicious content. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fatamorgana.fr/uploads/assets/file/99365388900.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9c2de716b---gozijawiperisazulo.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726a47aaaf4---77043880640.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c914ea4eab---85013465462.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a59501b745---17584885704.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/tuliturutoz.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be53818d21---famub.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/a8skecofk7baaut0c22mq3biv5/33165357858.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/72843006739.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/74927905255.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/xekuxowutimalotifitusek.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/93317546793.pdfIn PDF document text
    • http://hondatayho.top/img-ngocbao/files/bupubemabivaketuzode.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb0a1e4d20---37343605310.pdfIn PDF document text
    • https://kenadong.com/contents/files/jugaj.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/cae4832342d89a7e3defd9f6a08b4daa/gawuwazeravenoduku.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec77553ca4---60924713303.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/24b1e1fe179f621d20e0647be5a0cbb2/2952213661.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/lediv.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/palurozujojife.pdfIn PDF document text
    • http://ausafe.net/images/art/files/49437409852.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/545ac69edef0106a9450374ef0537355/duwanisuxaxemadevako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ban+this+book+alan+gratz+pdfPDF 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_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 17828 bytes
SHA-256: c294fae90879aea6087de41bc979a3c9a44bc75dc67ef3ad8dc684a5207b82ff
font_01_sfnt_off00013dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155EF 10988 bytes
SHA-256: 0648520c621024e7968d4385bef98db7e5c462ae840315b5f79304e6cc76872a

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