Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e18d6f377e79ea3…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 05:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69638eca56ffa156fa24f28d5f7ffbd4 SHA-1: e814e4548a0eb8a16f7d9727c129381393e2ad04 SHA-256: 0e18d6f377e79ea30cb6a06984590ca90b76fa1e106d980b6ebac94309a4395e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a deliberate attempt to host malicious content on potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/68839a72a30d3cdc3156b90ccbcff3d4/sajerejunetekiminitugo.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609eab143240c---39728745802.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/82939129063.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb47158882---63751930531.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5f0990df12affffb6dc4abd35f6b290a/rosevatatokikavud.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/debexasozuvuget.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/buvezuxelirazefurokuro.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/afdc13cf0c0386bc8ee6b4223926c3e7/godepo.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/h6ucp0fuh227d24hkcdch096o6/zifinawadamotatugededo.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/detilevivokejotudana.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/jidifoj.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/shopm1s4vavh2o0rf2psmhpqep/48275639219.pdfIn PDF document text
    • http://ultrabeauty-ff.ru/userfiles/file/8769917118.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/vuwavegorul.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608aeaccf28c3---bugodiruvidodelug.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/68614983995.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b41c4329d---82766443110.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e34dcce4d4---zisudaru.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/175936702.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8f8b17282a5ab5722496c0bd3f8ce85d/20315056454.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/pabut.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c90092d1bbd---tumiresexewer.pdfIn PDF document text
    • https://kristinanamaste.eu/files/lelek.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/ruwifiwefozuzisifez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=terms+of+trade+notes+pdfPDF 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_off0000e0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BD 17856 bytes
SHA-256: bb76b60d609ad6a4daac438c0bc2e0440abd7728db2a3c0d7e0669aced46d424
font_01_sfnt_off00010f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12753 10484 bytes
SHA-256: 03432144b0f47d851ad8589f9d31bfe5638aaf0f37604ed3b2d87b9f6d9cf37f

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