Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e9be55ce08216e…

MALICIOUS

PDF

73.3 KB Created: 2021-09-20 03:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f4e1fffcf5bddafa44f3d7617145570 SHA-1: 6f5c9198537f1b226ac0b396307604475481bd20 SHA-256: e8e9be55ce08216e52d33aaa4fcd5cf677b2d70b6c1435a659630fa7ca73e084
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links align with common phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://condominiovillage.com/userfiles/file/dejizaxetafuf.pdf In PDF document text
    • http://ingatlantv.tv/userfiles/files/92507696930.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8pavnphc2d8e01skhjjs6dm2t6/2675872373.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/likum.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/menubesinadi.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ce5dc218a---donuru.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/49086686988.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/84632843602.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/bisuboteduwelelap.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/durolenikepadulupoxa.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/390065599.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/35163249361.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/49233449111.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/pixusinirataxe.pdfIn PDF document text
    • http://exosushi.com/uploads/files/82331038082.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/vibebenegimolamu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8btcatka6u3vk5gv3fll9vtpoo/25716747451.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/mozeju.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/lufeviruvelamulizawi.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/45502771844.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/ribava.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/84779299656.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/88215511671.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=morelocale+2+hebrewPDF 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_off0000b824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB824 10204 bytes
SHA-256: 83e49fdf9f355d2e09a6773dba4d51d361e2fc7b26ed9c9344587cf529df7d99
font_01_sfnt_off0000cf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE756 18076 bytes
SHA-256: 541532d5831e4f5cf66b048a4f4e34be3d471a2146bc17229fee8b090f7d6a56

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