Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe11d4d720ba0d72…

MALICIOUS

PDF

92.8 KB Created: 2021-09-18 15:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 374705bdee5fb74d9b3f9827d0ea53c2 SHA-1: f8e4a637326d1bc536a8a8132cf236613f60e47c SHA-256: fe11d4d720ba0d729a10a44ccd02a7391fcd4af4f6ab2a07df8a7c6b7d6877d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://unixsensor.com/uploads/files/202109040713151073.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/i6rmpqvac4qr0r59r01hpt2gb3/japewavixat.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/lurifonudalasezobenoba.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/19746587161.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109040612588792.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b839da3f90890f7b05fd2ea3aea7eaca/dezegagegosipug.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/xonijazejen.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/dusuzelideto.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///39793869152.pdfIn PDF document text
    • http://eva.am/files/614c81610a4c0406.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/kekomodutazafedu.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/75264818502.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139adf6c7979---vemabag.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/82113835995.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7e6b400e2914abb16843756e285c08f2/90269856479.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/lutaser.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/64035567259.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/getilizovafuvuj.pdfIn PDF document text
    • http://impactpluslearning.com/ckfinder/userfiles/files/dowoza.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/zamowofijoduvudi.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/36880884336.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffe933eb1---93729188006.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/84917470643.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/gorifedexojukufodukexanan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=hollywood+dirt+full+movie+freePDF 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_off00010811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10811 10440 bytes
SHA-256: 87a890e42e4a356461e625f81e25478a1c708f8abc38e6fa57577802c06c802a
font_01_sfnt_off00011fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC2 17692 bytes
SHA-256: 2f66f0f1488f9d82a0e6935b23034fa7ce86bdde7521babb95ead0b9d6b96423
font_02_sfnt_off00014db7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1