Malicious PDF — malware analysis report

Static analysis result for SHA-256 92d57716cf8487f4…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 07:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 654a3cee1321a8a21bfbe0d8be9714ff SHA-1: 1bd7d509f309258f7cf076a9c88d68340320009d SHA-256: 92d57716cf8487f4a8239ff64ad7e943d34e8207c10396df13a58708ffff9226
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress upload storage locations and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm heuristic indicates a strong likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://iieng.org/editor/ckfinder/userfiles/files/27421547591.pdf In PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/l8o22m9g7l4vpkvpnie41vqm4r/murofexopugukaniwiju.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161364ff70a527---75257719800.pdfIn PDF document text
    • http://konberdbio.com/upload/files/69931055441.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/jajoxiv.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210901064233.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/38178054742.pdfIn PDF document text
    • http://seamacros.com/upload/file/xuroxowusovefoxupax.pdfIn PDF document text
    • http://erpos.sk/data/files/gapum.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210901110323.pdfIn PDF document text
    • https://ewt.cz/res/file/46706892468.pdfIn PDF document text
    • http://rhondadejean.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/99524844752.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bf7e291ce---wipujozifigovumuva.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/81851103730.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/37534588398.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/50575348793.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/sizukebijapiri.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/43730872914.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/sevinufof.pdfIn PDF document text
    • https://baongochoa.com/upload/file/69836471663.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210907211026_brfmsu.pdfIn PDF document text
    • http://soles2walk.com/data/file/lofurikekefetikujekexupak.pdfIn PDF document text
    • http://mamam.by/upload/File/file/82639921154.pdfIn PDF document text
    • https://rinducm1.com/contents/files/25695472947.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16138c662c523f---wivefepenovurasiju.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/19250336238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=infinity+kingdom+mod+apkPDF 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_off0000c6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C0 10552 bytes
SHA-256: 1ad033d98e42b1cdfd4c5db537c20761c1d192ba34d60e58a049d4f26153a94f
font_01_sfnt_off0000de91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 17776 bytes
SHA-256: 442ee8811c60719d7f9766a336280d509f0256658595fe882909c03c7f48f348

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