Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5505df6c71af4a…

MALICIOUS

PDF

84.9 KB Created: 2021-09-10 19:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3235e052cda9511b0aaf6003be43db5e SHA-1: a964b8e5f95eda821834ad09299a64ad97907af0 SHA-256: df5505df6c71af4a8c8a78139d066385a71f56ab459d2dc877515db74fe4aca7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'download button' lure further supports this, aiming to trick users into clicking on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://remobudostol.pl/pliki/7822045561.pdf In PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910033751.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/77677176497.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/piwegaxozovo.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/nodubapalotepejidib.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090300123052.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/32570490494.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/lepadunawemurib.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/garex.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/podd5ntuc1dn6a78p8o4fnra0d/kuguta.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a8a98f50ae9d005cbfefce42c4742865/revemuk.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/kepakenu.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/jagunidu.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0a1f4105f---30840897299.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/posepiwugow.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/82738895045.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/89768605132.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/bejomekeriger.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/84d77168455e11e50ffb7a83df2db163/87732692792.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/litugiguloluban.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/28691744010.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/13955237251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=handwriting+fonts+for+androidPDF 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_off0000e863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001007a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007A 10428 bytes
SHA-256: 9fa0d7d5c8bddef8ed061de20fc64f573b9ca6a6d61c13787dba1ce01d9607ec
font_02_sfnt_off000117fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FC 17500 bytes
SHA-256: 3fd409a4967d68bc4379ac13f7cb1a8be2ae5af0eb843c0475c826d8634db97b

Open this report in the interactive analyzer, or submit your own file for analysis.