Malicious PDF — malware analysis report

Static analysis result for SHA-256 a451fda785bc2f9b…

MALICIOUS

PDF

245.8 KB Created: 2021-05-10 00:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5a9ec47104ab3ed981527f9c5ccd33e3 SHA-1: cee5fea44998e34d4a4f2b8f47936aa8e2883734 SHA-256: a451fda785bc2f9b65d4f264aa9c35a57b1a68cdf23ef54514e122f2b91aa20b
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a phishing or distribution attack pattern. No scripts were extracted, but the structure implies a lure for downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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://m-co.de/wp-content/plugins/super-forms/uploads/php/files/k4bjj858mb9pl2j97otrraje80/sifibudatemin.pdf In PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/d85f28777100de4b36b3467b5bffd9f5/lilupaze.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/12959414276.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbea978c80---toninetoton.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/pulobosupetogudamixa.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/56441474158.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/7c1c4626dccaec4f91d93ffaa2b32f1b/16135531802.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad607bb76---79203382948.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e64f6cce5e---38566660903.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/uskoflps6mo5qm0e9k49tuf5e6/87856266185.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/27548838e9d27f080ede9a7ce5b3bda7/82272392514.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080493bd138c---86456208419.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5da5380c77c032278df8e352424afe3b/gusuto.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16079ab92e0428---36049391484.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609566ac0007e---bogajowotefobukameze.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=boost+your+vocabulary+2+answer+key+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00036774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36774 1560 bytes
SHA-256: 3c26a8223f1d007b35d3fc63bb968b1244831692f8a9bdddcfea4213fe8ed82d
font_01_sfnt_off00036f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36F65 5788 bytes
SHA-256: 983088744f17531ab8860d68ab02421529ec01bff183df86c8d0403e61d0e86f
font_02_sfnt_off0003834b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3834B 31572 bytes
SHA-256: a52795efffacd1709fe00ab3515dbb77ed9493104b50882a23361d4d871bf615

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