Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4ed66e47d771ac…

MALICIOUS

PDF

76.5 KB Created: 2021-09-28 02:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 767bd793faab018c5f8d4b4ddbf058ca SHA-1: 85a67c2cee725cebb138a40bd02d105e9d216f47 SHA-256: bc4ed66e47d771acbb23aedcf8b7b01ff3b6c05b1da949b01327e37d6c4084f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the ML classifier's high confidence further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=apk+dunia+game PDF link annotation
    • http://fixafilm.se/userfiles/file/zunavopovisu.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/zijilur.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/85843995397.pdfIn PDF document text
    • https://actor-conseil.com/files/file/33573070021.pdfIn PDF document text
    • https://dm288.com/slicice/file/16516412265.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/57290111387.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/bukoduzepusexifixumu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e768051aa7ae8cf9a1b415d1236f87ac/60603736315.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/16057164786.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145b511a0a36---34410104301.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/12496971930.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/zilotesawunowogiwidopevad.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/6djt41rpjmbn32j4vgk6lv32q5/tizosoligizanosav.pdfIn PDF document text
    • https://digireg.sk/upload/25191131195.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/44863793234.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/54818550664.pdfIn PDF document text
    • http://hanauhrova.cz/files/16159414024.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/4145760288.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/xivafisilujo.pdfIn PDF document text
    • https://31app.com/userfiles/file/baredabube.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/65697707329.pdfIn PDF document text
    • http://leeandrewdavison.com/download/69226331201.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/80452180496.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/23556600903.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/xodusuforirimapiba.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_off0000c269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC269 19232 bytes
SHA-256: c7c29119b95b2b305ccd47a81fe902b9a20c9deac11224a15a570873f890c0d1
font_01_sfnt_off0000f534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 10376 bytes
SHA-256: f583ed5267a8e2ef857b89580346c44435955fbef5cd2ef3a93d49194ba9d475

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