Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ea45efd4352c4d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-04 14:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e843c545a3cfa992f0473c3b29859903 SHA-1: 98ae6bf7e80f600d245d94b83bb794c1d1e5d960 SHA-256: 36ea45efd4352c4d2f428bc36473fbb049f525e1aaf1e48ac47d8cca663def10
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised WordPress uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or SEO abuse. No scripts were extracted, but the presence of numerous URLs points to a redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=fagor+refrigerator+service+manual PDF link annotation
    • http://backupcenters.com/userfiles/file/23826998805.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/90193014556.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/adkd3f2pb310ol79rukeb35l27/rawisafab.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/xumatojaxaxegukibe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9dae9be71---leloxelivajetom.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/c09917ef34e709112ac71e9ec0edbb38/vuwukidivifuw.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/goxelidozujukufefa.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/758a7r1on0q0qb5hges8s7fhvu/fetufa.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/buxavakuvesejosusunovupu.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/xoxogerugowufewifekogix.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/99425449198.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/xebuposodu.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/99866424700.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/12342884319.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/2998906733.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/lodixotajugejamakela.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70984a9439320dc13f0cf03272ffa2e0/9029666243.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/87943167c2a2b6c06cb1ab2c4b7ddb17/66086691784.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/15789681371.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/pezokamufuranas.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/aa6fc5fc54c56cdd772fbffeeb6a4e2b/jexuwitamezularux.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/c1d815188330d53d8337a7e71b9fcb70/32295630871.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/47568275495.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dea00e038---30078598941.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_off0000d11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11A 17892 bytes
SHA-256: c8c5bd8bd1eda676b5b23bf25242f578dbaf72179d4345c13ea17970678dc547
font_01_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 10824 bytes
SHA-256: 0f29a34f23d78b2bde69b192e97989b5df75dd1c89653e245adb7dcf5fbc349c

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