Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a3163e1164f2d1…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 22:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 154aa9f2d8bb9e359dcfc42c4d1c65d0 SHA-1: 8855f824508f0ec29495a96a3ff3536b84b57925 SHA-256: 19a3163e1164f2d1d2db5c60df8cf88354a5f8e563d27a69bbe7c20bc8c921a4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many pointing to compromised WordPress sites and potentially disposable domains, suggesting it's designed to lure users to malicious content. The presence of link farm techniques further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161358eafc2ca9---35157167774.pdf In PDF document text
    • http://tianlanip.com/filespath/files/20210913004616.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3b1e325ec---79325191227.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/34616855508.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/pibivewixubadelow.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/67868707064.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/44174791299.pdfIn PDF document text
    • http://yourmoneyyourbank.com/uploads/File/63934322001.pdfIn PDF document text
    • https://5udua.com/contents/files/97948879455.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/31356836186.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/12899650828.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/nofufabo.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/2552237755.pdfIn PDF document text
    • http://kgmda.com/upload/files/26356020899.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/41280289843.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b65f2029---42201513390.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/78572979593.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/gidovatamanagonoga.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/e8b1a2830ccd443a076ad530c8f958d7/2845486770.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/sugomokuru.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/rimukujobipabuz.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/nufukenuras.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1612fef49af02c---dodev.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/60145589908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=truecaller+for+pc+free+downloadPDF 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_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 10404 bytes
SHA-256: 5b64e88917f7dcb047a50dfe9842534af83c9a76dc0df74c3ae6459861cef127
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 19392 bytes
SHA-256: ea1b3f635f5e42e711c21b2e663c1aa0a3ed28b2fd892a5b5ebb1a6c6620e09e
font_02_sfnt_off000126ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1