Malicious PDF — malware analysis report

Static analysis result for SHA-256 faec8b182130a84f…

MALICIOUS

PDF

87.3 KB Created: 2021-09-20 21:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ebafd3b082a62cfa5314801504cf7b8 SHA-1: 98bcc7db65bf40c82910e99bb5ccf1d0a21e71c4 SHA-256: faec8b182130a84fde6121d69b1678cf393bd92dc930efc28b29f0651f375535
156 Risk Score

Malware Insights

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

The PDF document contains multiple heuristics indicating it is designed to host link farms on compromised or disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO poisoning. The embedded URLs point to various domains, some of which are associated with compromised CMS uploads or appear to be disposable hosting, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8d794bfc18d2d92cb1c705494e5f5252/poxipeja.pdf In PDF document text
    • http://bridgeonlaw.com/filespath/files/20210918073554.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/solupamor.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/63600106121.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/kopavopi.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/91062096521.pdfIn PDF document text
    • https://estoniapools.com/contents/files/60222709495.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/45932059823.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/77774492657.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/xafowize.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614049949c58c---23193864605.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/64476986784.pdfIn PDF document text
    • https://schmitz.cz/res/file/10344806895.pdfIn PDF document text
    • https://casasholidays.com/scgtest/team-explore/uploads/files/jarulujupisifadub.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/30303091518.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/liwinevomuxosuzabo.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161390a92eeb21---gopirirolajaxowux.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/5038845570.pdfIn PDF document text
    • http://net-marketing.hu/images/files/99043318630.pdfIn PDF document text
    • http://geose.ru/userfiles/file/sofowarutefilisoxa.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109012102521029.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/nibadejiforitok.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/49136780480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=does+factory+reset+get+rid+of+virusesPDF 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_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 17872 bytes
SHA-256: 41d8c8cb9aa13ab14632150b1709d23fe5113fe4471a0174a86e26a84e363659
font_01_sfnt_off00011eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CD 10780 bytes
SHA-256: 65a69bdacac9b79af141af68577d21fbb60a948662371aac2eb5e95ddfed0891