Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed14e09623bd01f0…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 21:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf55d5ffb86fcc1016e87b67fba67a82 SHA-1: 8333b8a2233cfcdd23700998b8794b42e277c9ba SHA-256: ed14e09623bd01f027ebd208da30d85b4d50d44a912d755cae7c75c059db344c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting. While no scripts were extracted, the structure and URL patterns suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ccea66c7c2b---98623745432.pdf In PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16087adfed044d---42754189764.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///soterepetuminepulaji.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/kifizunogagukesa.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/40319255905.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/14693965612.pdfIn PDF document text
    • http://asustainable.com/global/file/26237464696.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160afb7f0ddbba---wimomojewidodurigata.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/77043750320.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/95802282061.pdfIn PDF document text
    • https://evboosters.com/wp-content/plugins/super-forms/uploads/php/files/f68c2e8efd78c08b897e66d15010a5b5/lozoke.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/o8l6um5vhke7nt4l177i44s9o6/lebedulededanitir.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/71858596758.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/nitigusuluduza.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1876464659611b8a4f68fd3.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd0c30b6b87---22694336516.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc6bd71384---35430651168.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d04ec798c3209db58b8ece039734da7a/jenimelusatesuxi.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ek5k6jmono55fib959l3nc5270/loruwupegavaben.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/520ca2a47b812acbae14fe5ef3dc0490/72069230296.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c01ca813459---58862907293.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077d13603a2a---sotowujura.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/fjobeu89jkrs7bg0t6ed0m36iu/ziruxegarejusosibodutaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=drogheda+to+dublin+train+timetable+pdfPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/gugutevikoperebatorupomu.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/8327586892.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_off0000dae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 18196 bytes
SHA-256: d79ab82ac9655da873bedbe283674cf1f0d58d252c1274972066b908d546f577
font_02_sfnt_off000122c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C8 11016 bytes
SHA-256: 9d27d66b6c835b5e63d2fb914ef33c082f639d97968706cc6366d40f2de1fb1e

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