Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0e520221e0714dc…

MALICIOUS

PDF

74.7 KB Created: 2021-09-10 12:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fca335faac874dfe4d3c7ccb76f708cd SHA-1: 46b1911b1d86d034d4a0939060164277cae6661d SHA-256: f0e520221e0714dce1c986bce4594cc70900dbee2e65f6daae17e2aa84988c38
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous embedded URLs that point to various domains, some of which are associated with compromised CMS uploads or disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://poexali.org/static/image/_u/system/files/72017003611.pdf In PDF document text
    • https://weddingitaly.jp/images/file/mibitakeloniladi.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/dapozojinege.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/68774325806.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/j7eif8f8utuohg343argpn8pua/guzavedowozimisuno.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/d488c7e233c2fd8716730795ed0eb1cc/nejeluwogev.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/af5dc8d05bdfc0ebca153b2221e6838d/74978909909.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/4912780968.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/81328497269.pdfIn PDF document text
    • https://bunianco.com/other_files/File/raruwufedogosemaj.pdfIn PDF document text
    • http://proxima-online.it/public/file/19682477130.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/80956602644.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/59320491869.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373073e1862---15659123644.pdfIn PDF document text
    • https://allianztc.ro/files/file/luled.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/3658900762.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091012523073499.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/xeduvotekeneritabefajapof.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/25212306672.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109051820503639.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/lugod.pdfIn PDF document text
    • http://fruitvita.com/files/files/49631313845.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/loxefepakexuvosu.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/budonozi.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/pefekuwezepaj.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/031303365542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=boku+no+hero+academia+season+3+eng+subPDF 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_off0000bcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCDD 11228 bytes
SHA-256: e3837085143291830f5ccb32b260a36b1056e3108a0aa871fe667032a0915996
font_01_sfnt_off0000d6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CD 17772 bytes
SHA-256: c15b3da88303e30167feec487f89aa94c2cf61e88fb777587963a324da20074a
font_02_sfnt_off00010567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10567 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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