Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee7f726412a68244…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 08:05:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 13e2ec9f0c5a0b5e1424a50c9a17f0e8 SHA-1: 27a6f48bb9041a1e638774da6437c41140b8b1f1 SHA-256: ee7f726412a68244a9ec8e88c60d1ad723a9e921f598a4511d1f6d5d743daa80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://jkbprivateiti.com/userfiles/file/96240216245.pdf In PDF document text
    • https://renesens21.com/ressources/upload/files/puxawopunawarifiwivi.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/53321635892.pdfIn PDF document text
    • https://www.champagne-auge-dascier.com/ckfinder/userfiles/files/75977882673.pdfIn PDF document text
    • https://ibericadearmerias.com/file/sefepafofetafu.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/50998510844.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/c1116ef29dc9ed3e6f6c5d85fbbd6660/10723941575.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/99200470651.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137f9fc58620---55442799160.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/33446716359.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/93996819894.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/zozogizemamipijikireni.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/11320928683.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/pixopututufuki.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/474896280.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a435579c---nelewaxizosuxumajoxuwumet.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/jivij.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/vijekuruziwano.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/78586841091.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/78097919911.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zetelemazaxupalesebol.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/85935366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=java+function+callbackPDF 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_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF90 10316 bytes
SHA-256: a6cb48ddf490b2d714f6db1492f3cbaee12cfd6cdca71d86dd2f85e4c641637b
font_02_sfnt_off000116fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FC 17832 bytes
SHA-256: ba7970febaa4132ab9160bf4f0557365f6077db122369c0226d65f35eeee258c