Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b17a7c5a9bb2c65…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 22:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fc27a72740d088d40701698ba33c1b89 SHA-1: 6e23bd8a4f558287037caaae710d1ca7f33fb368 SHA-256: 6b17a7c5a9bb2c65ca5ab7850e016fd91e3f4930b143bc28513d94dde56f6a94
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the 'link farm' heuristics point towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ros.by/ckfinder/userfiles/files/gaxonawutujirezig.pdf In PDF document text
    • https://lmbri.com/WYSIWYGImage/file/41400479714.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/dunerigipoxemagumov.pdfIn PDF document text
    • http://feminella.ro/upload/fck/zerokifajaru.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/surij.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/58307313441.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16139e60a12c88---wowukok.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/7795265321.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/66878230764.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/28702879085.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/85665988410.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/valup.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/62086562883.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/zadexurifew.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/84719605624.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/xezuw.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/kogegozapegimelomevesejis.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c828d6a38b---3095098413.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/deea19c98ca1c4eead66b998af5252d7/porid.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/64243938527.pdfIn PDF document text
    • http://skene.es/userfiles/file/bapakomened.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/66699505518.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/rajipo.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/parabirupisamujakagipala.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/lemofozefaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=free+skin+generatorPDF 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_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10304 bytes
SHA-256: 64bf38032742750c4c83ee393fbdd5aa7423d6911e4c374c281b58bbc86ecbef
font_01_sfnt_off0000f898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110AA 17960 bytes
SHA-256: c63ad6e5263fe03414811f2e2aa44b13a25a67f6577e212598c67d3aac9e0cc9

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