Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7c18ba4f6786989…

MALICIOUS

PDF

85.8 KB Created: 2021-07-06 10:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 7c61e0422cb01b05d075e955941407a6 SHA-1: 76569a13c6718d4d414951c9d3caf839cc9b6dc2 SHA-256: d7c18ba4f6786989a9a1ad09296d79676f5d80c41ab1dc260c83c4f16c32abe7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c4687d9f1e9---14308789969.pdf In PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/f6f2f13ca7367258fa98a4dde2bf535c/40517398639.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b990744d3c8---farozuduxagositixerabujev.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/dewugewumazake.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ee5f0ef97ae282fca8def91f751adf35/64319732528.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/povorivol.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/bb4404fdde687c0b7d02800794a5f0aa/movigoradav.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e817c30f76e23a1e43bc8bbcb501fbc0/xawivogufuxarotopat.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/163d4daf37f366d480fa144a495f6511/porizuni.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/juperewuzunofepurez.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210701_D0DDA0D6988CACB8.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/a1jt4h939uqtgskmr57hv52c55/17070960062.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/437df8048b369f9c12040c0618854cb5/gawamorux.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/25362781530.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/lefawaxizufibu.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/siromuxul.pdfIn PDF document text
    • https://egca.fr/userfiles/file/depoluri.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160aa910889387---33045512148.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0fd1d7306---puvugasixifinivewuvil.pdfIn PDF document text
    • http://jarosi.hu/files/file/5577923872.pdfIn PDF document text
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/72824789324.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/41d6f8285bb19dbb6365f1cca734058f/zisamonufekadi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9e663025c---balamawugadakola.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/94307522893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=wah+baby+cry+meaningPDF 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_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 10492 bytes
SHA-256: 3590983630566f4f9b9cffdf3ad97f563b142f7cceec7673a03ef2a7d03f7708
font_01_sfnt_off000105d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D5 17004 bytes
SHA-256: 333361be9089ecaf8c6b75cfd39cfd6abee9b54a240fbd4f3c81eb911b2f0898
font_02_sfnt_off000131d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1