Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5d9e5fc51a86fb…

MALICIOUS

PDF

92.4 KB Created: 2021-07-30 10:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bf355b070771a1825de291777a1a110a SHA-1: c6a575a90b421c9cf89db55915c987b75253e46f SHA-256: ee5d9e5fc51a86fba69f3e9dd45a7f663612e81b32c48767066a767ee117392e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress upload storage, suggesting it's used to distribute further malicious content or phishing pages. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9673

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 http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608364b35dc48---73054061601.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076bbb08168f---2090035587.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c552325faee---53567683032.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9f552fc35---sugifesasi.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/14759543351.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/j7j4ao0u7uprtura4mnm6olls8/95717910161.pdfIn PDF document text
    • http://imaginove.eu/data/Files/xipubafutedevejamowe.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/tizawidukud.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/608320582.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/24871050479.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/zekutufamedavebazakaworum.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/54508600688.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/93986060591.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/70e249367d6e2ee409ebe22828ff54e3/gixizavatuxomikodewi.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/8526104e22009a8988975b4952d98563/mibelomotafagesadufikar.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a629e707a96---wowutedebupotaxofal.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/42d4ecc3d68301f57047bd1f0bc46df6/jidazexiziv.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/04e087fb889ab7a73f268ae717cc30d5/46038792613.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/nubidigufexafon.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fenudakikab.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828f5b6f8f5---15494507516.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a58f91aca773bc6a10e5804b9d45e857/kubexujufixi.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/29800898100.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/totitokiruvexe.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/kijupawo.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/74014874687.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/nupirufusoluxogokesiniro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dukan+diyeti+kitab%C4%B1+pdf+indirPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CE 10648 bytes
SHA-256: 0502bffedd262e7ac0600900737959abd93eba07a7f3ad379b3fe5d22bdddea4
font_01_sfnt_off0000fe10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE10 17960 bytes
SHA-256: e84f9af0a4ec82f5e9b7931d5ed0a24e0758fee278dfe5c335edeef7c4376851
font_02_sfnt_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 18508 bytes
SHA-256: d7c9661a0361f2c5b002e07356d879bbce2e4c7c0891a60a6d85dde1c7ed2db6
font_03_sfnt_off000147af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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