Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b11c9f2cbb352bc…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 13:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fd4fbbc7c873e9464615f12d4f0db281 SHA-1: 92689e0ed8d16e79095594f9e2e9bd046696f0ae SHA-256: 2b11c9f2cbb352bc68c90bc0db188870d2b7b8036496e47feb542479f71bfbd1
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS uploads and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic further supports a lure-based attack pattern designed to trick users into downloading a payload or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://stsmcc.org/www/js/ckfinder/userfiles/files/54289984922.pdf In PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/kimawadusi.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/38067686894.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/kakefuw.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/94666671645.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/sojotejitabaxo.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/wewefegogokogudelakiwoves.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/41165667903.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/rumewiziworanunubeb.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/5274851651.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361fe9ecc31---11798122934.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/11477479270.pdfIn PDF document text
    • http://greenld.com/userfiles/gidezagag.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/79305513358.pdfIn PDF document text
    • http://www.sczct.com/up_files/file/fafexefepobawajunupexolej.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16137bd06c4db4---dojupapibezaw.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/11456796668.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67eb7fcb9---91626846142.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/vamup.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/32302642839.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/lotararunuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=autocad+lt+2018+crackPDF 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_off0000ea73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 10544 bytes
SHA-256: d53b8c4a3e4c4643320bedf770307011f69c25b4d502e4451e43ef14235c8a03
font_02_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 18440 bytes
SHA-256: f0bd49d94a41255788e39a34de28553f0d0dce8b5f5c4832353f3d290ccd7f42

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