Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87bb2b4d62b43ef…

MALICIOUS

PDF

76.4 KB Created: 2021-09-05 01:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85175f769c4668c58600c23c62fd8a1e SHA-1: e8b3ca4c708b85b32d325c4f6eede3ff3cf606e8 SHA-256: d87bb2b4d62b43ef7b7ae46183cb7f383f684a1c6ff64314219307c2d6ac8853
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting the PDF itself. This structure strongly suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/9e079d17559ca1c5cc7434fa3aecb4a1/lopugananugurubalo.pdf In PDF document text
    • http://massvt.sk/editor_uploads/system/files/xefazagexugodofuti.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/11687627613.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/75935088418.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053fb6c6c18---jakuzumadat.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ade1r2r84d3ct39c9rhgv55md4/26985999253.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/76454125368.pdfIn PDF document text
    • http://saktigroup.in/uploads/foxisunanilotixovuzafake.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/32402957662.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/rawazoji.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/c30f3bc8cfd1c1d59124419b611c22ec/97155521222.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/amlp62hkmvtih0sjeei36qit1r/wapozomerugetonofujuwope.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/dozikuronamiz.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/e84a6b710035a5ccdd0493a0f9c15fa2/tabuwavetadoti.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/nekogatesuko.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/5c2ed16977096e1a21806cfba7780e15/xukemino.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/4bv421bltpdfsald5uc6f34a6q/kifikoza.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/c5864e94ea611300f08a578f103b1d76/luvej.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5792f261a9---bevad.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160beef2e5437d---18237413047.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80336185079.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc3312a66---60912387966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=daniel+gaming+lspdfr+installierenPDF 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_off0000be00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE00 20300 bytes
SHA-256: 85ddb3018196dbf50f99e3f4f462e2e43852b4be9bd3291905a927545978f48d
font_01_sfnt_off0000f3ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 10724 bytes
SHA-256: ddeb799503b5ad45ac62cb5feb3b5c1cc32147406fa7e90687e890c5e9113467