Malicious PDF — malware analysis report

Static analysis result for SHA-256 c15ac5bf62e6a1c3…

MALICIOUS

PDF

87.3 KB Created: 2021-09-05 21:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 416ae71cbe3df973544e09aac4488ba6 SHA-1: 3f8eb76bb49eadd6290ef6889f07b5e6de6abd2c SHA-256: c15ac5bf62e6a1c392ca32d6e7ef5511b9bfafb7800c4e8978a9d90765f6b703
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many hosted on compromised CMS uploads and disposable domains, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable binary data, providing no direct user-facing content, but the heuristics point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec7e25b1de---99062672816.pdf In PDF document text
    • http://feriaalainversa.com/uploaded/files/wasedurevedarusoralu.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/nexosalizudoburivoxam.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/dejazozezuxakiwu.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/44c127878d6485f76242a925c7789031/mutet.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/88926884196.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5787b3297---85122276024.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/nobabinatodokesuzibobe.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/jesinoserubabubex.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c8a8734c---5036849434.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/279bc04b2244d4a1f95bcbba4f059325/gevuxufiduwapakakonepumi.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021052402313289.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c706b7c9824---19738089047.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/17664393730.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/daxobufu.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/tofugewot.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8a573c718---vanevuwipeladijuseg.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/989f5d203c3d7d19f781fceb9083b67d/xolalorisovowavujixopem.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/rinupoziwakuz.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/61128055399.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a179e0ba21da7ee3d57d176df7ac4598/fizunewurivokis.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/53530413854.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/pajozejivowego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=abaqus+documentation+2017+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_01_sfnt_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 18064 bytes
SHA-256: 69874ffbd474eeafb9e249b5a0a516db20bb0c98c46ee4ce6bc0ed5d6ec972bb
font_02_sfnt_off00011cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 11348 bytes
SHA-256: a12222b308c941a0540e4ebbbd0255a1b408d62fbfc6d64364722c45c8f382cb

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