Malicious PDF — malware analysis report

Static analysis result for SHA-256 5214994ffaee495c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-17 21:57:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89c63230a9415b39b89260362a0c8696 SHA-1: 11db73a0b429925dfb782c4e0b985142dca28a9f SHA-256: 5214994ffaee495c1f2790a7f7626100ca0f9625abe1b73dba0cd86fcf62b7b8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates potential for exploitation, and the overall structure points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=aadhaar+qr+scanner PDF link annotation
    • http://centreforeffectivecoaching.com/media/file/tutesekulevibijuf.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/57617160694.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/beranupajafupavusatawetaz.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/foliz.pdfIn PDF document text
    • https://quizai.com/uploads/files/tanakizetomixopazoxuxilup.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/rodadoxubezigijifa.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/58506431301.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/20355509462.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/palefutox.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef4a9d7a19---rapifupuwijisarapusebiti.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/vitapirisekotadokajis.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/48524239807.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/wisukulojijubisi.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/64249498038.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/47810132189.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/80350027366.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/73698665845.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/71242138626.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/16127782151.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/xamezawenejaziberosefa.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/25707883618.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143aa2895ca5---zazegufiki.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/m7al1n2075ssbehn70peqn4u1i/kufitibez.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/51111347232.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/bototaluvajegenamiril.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_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 17316 bytes
SHA-256: 7231136fbb3290e98e06b3a7cdb374486f24f0a2822ccbe62ced091228f1e9cd
font_01_sfnt_off00010144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10144 10240 bytes
SHA-256: 05eaaedaa2d28e303babf15f2dce5b51ad1490674bed2e0f6fb60493a481b1dd
font_02_sfnt_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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