Malicious PDF — malware analysis report

Static analysis result for SHA-256 00518c4ce61443af…

MALICIOUS

PDF

86.6 KB Created: 2021-07-05 18:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: abd1645e6748d9dd440a2863ee7b37a6 SHA-1: 1a57f2e54e0b5f9beadfbf301765139886ecab4c SHA-256: 00518c4ce61443afaf8843f72aaf77ef14aeb5c6d79614e1e8f55cb586a1459a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The embedded URLs, such as 'http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609effe23a46d---49927603920.pdf', are indicative of this malicious intent. No scripts were extracted, but the PDF structure itself facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f7a807445b8704360c81209be7332832/3073995511.pdf In PDF document text
    • http://hevolta.com/upload/file/jivenepifomejizikotax.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a21094ca813---53055469533.pdfIn PDF document text
    • http://amtutoring.com/clients/865321/File/gigigelifijupela.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/bc987d0aef367fc5330e4b046c86abd5/71220467543.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/38dc1e4bce9a8acfcf1a5a65dc8a9fa4/57457265871.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/s27drkqsvo85i5pui2e3t3aqbt/57172838559.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/533c7e4141fc7ba6a21b9bd8910f5c0b/70744057098.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/89792862708.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160825b8f32b94---97501315904.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160742b0943e75---supid.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8ea2a119---52177906449.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa30430bcd3---49089875384.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/birosawogegolivipofukal.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/riposepirino.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a472e65e426---kumetakinefogal.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609effe23a46d---49927603920.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3bf8fa5ef172e5ab1e4ed2f5ebafc435/67082778221.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/18399897872.pdfIn PDF document text
    • https://loctra.net/userfiles/file/xuwoveduli.pdfIn PDF document text
    • https://mattress-leader.com/media/lewokagoduregaxaruxuw.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/31874876406.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/rilanabakupiwexarelodav.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/36234261913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=iphone+12+user%27s+guidePDF 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_off0000eddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F3 10620 bytes
SHA-256: 0a4bf61b6a20b75186a65bb7bbf57770c472da079ed8d7a2046f5adc86175451
font_02_sfnt_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 17912 bytes
SHA-256: c0091b52941e5cef278f2c8727c09dafdd10ce959c6bccaf73729e8a7b1cbe2d

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