Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed780714a3259b81…

MALICIOUS

PDF

89.2 KB Created: 2021-06-25 18:43:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f41a55fff183a2215737f7fbdce105d1 SHA-1: 95e9cd5805186cc105c5b2f7c2d36e86e43da4cf SHA-256: ed780714a3259b81470eb7523df2b80d496b10d24a56b117d1b7e514e7116819
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ughjl294seh2jofb7lorfiqs6m/63035509590.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vet1co0vgoqu5u1gom1leh79p1/20240219005.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d27cdfa5d4b---8810479913.pdf
    • https://twr1115.net/files/fckeditor/file/79653110016.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919184696e---60711845103.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e8a0bfbba---69947739181.pdf
    • https://perfecthospital.org/FCKeditor/file/56418050681.pdf
    • http://volamtuyetthe.com/userfiles/file/dajaxodojos.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/gtvbpp67pvu4qd443q7nohc5a4/36975428806.pdf
    • https://afayl.com/userfiles/file/kesekofovefawokim.pdf
    • http://tara77.com/clients/46590/File/33193075714.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a675dfe76ec---kibetoludoditezepimewemal.pdf
    • http://podushka.by/files/files/33900185948.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/4af4b18be87020c20d7e0bae5770c83d/dudulajutanum.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/cad391ed884e2cfe7d942b8251581fec/43894835366.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a74a79ae4---funodixeletiga.pdf
    • http://tranhtreo.com/images/ckeditor/files/kebitum.pdf
    • http://candientushinko.com/images/file/galurijuxetibaniso.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c576122b5fdca3565c635aa55084f4b5/97409051632.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607c61cdb2f54---jupatewigubo.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/a400cc3ac170b072ef8feb895bc488a3/gikevujedixubag.pdf
    • http://phoiinnhiet.com/images/uploads/files/41447251636.pdf
    • http://pulsarvn.com/media/ftp/file/sujabowifarafowobidova.pdf
    • http://canadanur.com/resimler/files/junofetibivuk.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+gettysburg+address+by+abraham+lincoln+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f682.bin
9dd0c68ca1d9c456d6394b58794987b391d300c9eee989be470fd67ca56d97fb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 17040 bytes
font_01_sfnt_off0001231e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1231E 16792 bytes
font_02_sfnt_off00013b35.bin
f2c1456d7a0cf71c0302f629f2eafc698824c2eef44b65dda6184c640b8356fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B35 11384 bytes