Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8d676737d89250…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 11:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bfb302881b0432a5e4c97ed6fa00544d SHA-1: 13f7f8d52f2619c9f179e746117d0efb9fde6e04 SHA-256: 2a8d676737d892501d9b1bff2fc825677a732a6e3fbaa9644be560c6f6e18c6c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to unknown PDF files hosted on compromised WordPress sites and disposable domains. This behavior is indicative of a link farm, potentially used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://damiel.eu/userfiles/file/zodakopukekaridaxigam.pdf In PDF document text
    • http://oilandgaswork.com/userfiles/file/mosarokibubenimewa.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/31459353014.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/5817395573.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/sigosaselukodu.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/fafosekizu.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/e59beedb90581fb17131e3aa2b4c8789/78438657089.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b3c464a6---vifilinuwolexata.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bkf4ngeut52vglip2immncp7mk/lologutelifaredilas.pdfIn PDF document text
    • http://staropolski.net/Upload/file/romigadarixawakagiguti.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee20cf577---68370815016.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b33df590132---31157813174.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8b72c3ef7f55c5b53503feb19f1a4fa5/lurobot.pdfIn PDF document text
    • https://codecs.roimages/file/94103552852.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8959b4ae---mabojebazun.pdfIn PDF document text
    • http://email-database.info/userfiles/file/23825233222.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/vevogesusalujemenamusun.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zupod.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7afdc8a1d2e284745096d2c9f7ad1475/jurij.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609524b336584---juvizurune.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/55477e3c8a431566f81d1bb298e3564e/55603122932.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/tudixebenipem.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16090b8823acdb---82410342689.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609648321770a---16329619040.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+clean+a+video+game+discPDF 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_off0000f0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F7 10872 bytes
SHA-256: 14a64191aeb5002eaadc5fd2b3342eba08413acfb7c12c323e47a398444214df
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F1 17476 bytes
SHA-256: 2631b8d220bf2d931c8709ddab0500e0cb4f9ff624a6238918517cffea1742fd