Malicious PDF — malware analysis report

Static analysis result for SHA-256 d056b95273c7ad9d…

MALICIOUS

PDF

87.6 KB Created: 2021-06-19 17:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6f6f62d2a465a32443d9be64575cdcdc SHA-1: 506af9a6e0bebd74beacbc154e2d793bb21f47cb SHA-256: d056b95273c7ad9d8daa54eec4c01464771b584583369e33fd731599611a365f
156 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842424ca95d---38379165101.pdf In PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/706bb8aa432465e143f9ba8cd05c424f/zanojomudetofinaluxenexu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815462e3bbb---88259049952.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/6937e778260120ea4bb341506a59b1a7/75516997038.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/kadixebusadurajoxebonaj.pdfIn PDF document text
    • http://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/pabaxogovetavukadifa.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/wupilatazuru.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/62662838757.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/gqpvqn8ti0aqhm7f9eadancsf1/28382039053.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/tewuguxomi.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/3842124487f3bdf415d8c3232a211cb1/67275992098.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/67559808347.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/196955641760913173be706.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/monojaxazaden.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/bm02o1qhhmnjf3adogl8njl8k3/82871087394.pdfIn 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/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=implicit+differentiation+worksheet+with+answersPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/e1d988585117b492f9831670dc84cb8e/sewajonab.pdfIn PDF document text
    • 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
    • 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_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 5488 bytes
SHA-256: 1d9a3e49e67f9d445d927118efd5116e757df176829fa263cd0f698712fed284
font_01_sfnt_off00011473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11473 11372 bytes
SHA-256: 4d3d35fca99796efb42312a92f06e8bb41b1f931fb4c7639798f82a7e8ec0b35
font_02_sfnt_off00013b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B91 16096 bytes
SHA-256: 3a87a2a80cb0740ff7ad33dbd9b35031d90241dfccc5ab96a3d2c3133af9c3ca