Malicious PDF — malware analysis report

Static analysis result for SHA-256 d761ca5db620aa39…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 03:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9912f800148616e76c5b2720bea8fecb SHA-1: 6f34c6fff84f9eb64a26a55b08794ab7afb1fe43 SHA-256: d761ca5db620aa39b5eff2c78b81edc86fd12fb145b49485af77fb5177c9c3f2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier and contains numerous embedded URLs. Several heuristics indicate that the PDF is a link farm, with many links pointing to compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=graco+modes+stroller+user+manual PDF link annotation
    • http://ixtvs.de/_upload_bilder/_filemanager/file/44610620721.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/10898568912.pdfIn PDF document text
    • https://olterus.info/contents/files/dilaw.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/b3ed4c8c1a0384cac3d13a9523ef2dee/98938341790.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/dakuzaxukoxupetuse.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/qme5e5qeb80nc4rb3vip02rhu0/73082874036.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26b75304f0---57145655393.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/62287347292.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/56452170268.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f6c79b1e189bbd8aea96bc5a0229d57f/defakupinek.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078df9c3dd6c---47719296960.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07d5ada969---28403448180.pdfIn PDF document text
    • http://runo34.ru/attachments/file/tajofaratoxo.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/be47a489c4860aa3dfa7098f7dbbb4a8/53983170647.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/53991621489.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076e9381a5a4---55038519446.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/66087558208.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608282ba22ccd---4948684200.pdfIn PDF document text
    • http://newworldss.com/uploads/file/sewigojade.pdfIn PDF document text
    • http://bigredclassof1960.com/clients/879476/File/tepowenefalemibo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/b540ad45e71983bcfa95ad7b7982ae40/49184651198.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/64837839580.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae23d279c2---68552322892.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/rosefuxirozapetam.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://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_off0000e6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B5 10576 bytes
SHA-256: f48d72ab336062922bd7bf9126c56750955ac3c515bd65e3722583386c835371
font_01_sfnt_off0000fee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE6 18000 bytes
SHA-256: bf997cabf317284bc3bac6ebffa0e74448b5bc47ffa25ec6a29d2e8a104c77d9
font_02_sfnt_off00012d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1