Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ef015e224619e3…

MALICIOUS

PDF

84.3 KB Created: 2021-09-13 04:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 34955b3c2e7f085350e1acce95f6d943 SHA-1: df33c322b3a921c7e399a95715e8ad3ade7200ea SHA-256: e8ef015e224619e3d5df47c6e383b667ffc1f2e9284a60e76ca24a8206d322ba
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous disposable domains and compromised CMS upload storage, suggesting an attempt to distribute malware or conduct phishing. The presence of embedded URLs and the nature of the link farm indicate a likely intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://emilline.dk/ckfinder/userfiles/files/kolivero.pdf In PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/87805149283.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/79638962201.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210904172353.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/47636eef603f37fba901f8525d2138df/zikeser.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/11071858261314bf854613.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/basapelogazibawutujapoda.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/71400087720.pdfIn PDF document text
    • https://oasis-travel.ro/files/48337978173.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/85262852115.pdfIn PDF document text
    • https://gaadalagi.com/contents/files/bomaxetilogixusexuduzus.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/73375077479.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a7c79d70---60280667597.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80c99ec00---joxoferowitobufivif.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/dutevi.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/25380273134.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/664ceb708bec5b05383b2893463ebc68/7634993018.pdfIn PDF document text
    • https://filetorme.com/upload/files/42059373583.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/gulelunizasexulebutan.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/duzax.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/zuserisegavup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=paatal+lok+watch+online+free+livePDF 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_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 10508 bytes
SHA-256: 5795a1ebc62ace93d0ffe873527274393def2a1d83060e9bcafdc709e0998d3b
font_01_sfnt_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 17968 bytes
SHA-256: 925be025183cd14cf41428a511d5827a747c51b80809798b87cf5ad8c7b4d7a0