Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b4f2e4f83f29dca…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 18:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 17ac04b0f58c8525b47e308904459ee6 SHA-1: 752aa9e45459cac82c10247d7328ee4f1a014c38 SHA-256: 9b4f2e4f83f29dca74bc5b54939df0a042560b05bdf7e4fd5bfe0c43d951b1fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/1cf7c0471f96e9630f2cbc3a75f5f463/85097928461.pdf In PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/66030960451.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/sosotititenufutewukodon.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/17837604627.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/pisum.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/bimiresigumomom.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/satuxegevapexosipavuma.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaa9033d0---mubiferudipaxifovedol.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/56179570461.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/84563096116.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/89122749430.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136121703ada---70174102973.pdfIn PDF document text
    • http://platcometals.com/images/file/68743483643.pdfIn PDF document text
    • http://muszempilla.com/files/file/40842864067.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/zugiluwomosapobun.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/55113716148.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/cfbb9a33357d948b6cf12a01f06e47bf/vumelofugamisebokogure.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/63453855085.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/dejowonogisagina.pdfIn PDF document text
    • http://thegioioto.store/upload/files/duxibedibipalibuzafixop.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/59229631829.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/rofelakurusojoloketo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=piano+partner+2+androidPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/39340585199.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_off0000df60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF60 10292 bytes
SHA-256: 651b6de2f0802508664f819929523693a62c496078b8e8f893e07fb97a3e0206
font_01_sfnt_off0000f6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC2 17824 bytes
SHA-256: 7402b2b4fe0e8831c587288f6b2cfe6542b3164d36f74f95e97278447b36e947