Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eafa47031839b23…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 20:33:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 129ce2c74d5a037aaa609a9e582fa692 SHA-1: 8a023531c835433460ff261885b3e75012f77d50 SHA-256: 2eafa47031839b23efde171b311d8c9f45dfb13e4272eda171f9a4eac4ce0faf
196 Risk Score

Malware Insights

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

This PDF document contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=hide+and+seek+unblocked PDF link annotation
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c29dd88e11---62737516521.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/50974123369.pdfIn PDF document text
    • http://apvn.info/userfiles/file/7418660476.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/wopusiruzu.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/lafitamifobatiwitodek.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/eme2o7tfcerbkbh04c4tb4cra2/64614398663.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/zetarolasuzidivakogos.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fb8a2735b---jisosonolofusonobetupaki.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/rasixanopepuzipaxekedum.pdfIn PDF document text
    • https://paperland.bg/uploads/file/27581439798.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/nopejenufufunevukegelob.pdfIn PDF document text
    • http://intertravel.hu/_user/file/31730142378.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/riwositel.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/73370211644.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3d44518e7---93570567186.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/jogazanomululumixuta.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/vevitobuxinuw.pdfIn PDF document text
    • https://digiconelectronics.com/media/1082469091.pdfIn PDF document text
    • http://machin.kr/userData/board/file/gofexepuwaterisogufilapi.pdfIn PDF document text
    • http://dongphat.net/upload/files/jofofusu.pdfIn PDF document text
    • http://vucert.vn/uploads/files/futope.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/nalejumafulifumodidubivi.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/55790045256.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/99177894090.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_off0000c9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F6 18024 bytes
SHA-256: a7d09ef81317c5ba2cfd721afd2f63705b98a3b32bf907bcbdeaa199ced002ee
font_01_sfnt_off0000f8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DB 10488 bytes
SHA-256: 8798028fe16e2213e26e625f31f87323bf28bdb0e1c33dc81d16cd0d98f3e721
font_02_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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