Malicious PDF — malware analysis report

Static analysis result for SHA-256 abf8919bb4fb2a66…

MALICIOUS

PDF

75.0 KB Created: 2021-09-15 09:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9289f95598b5b8d6dfab559b7f89ccaa SHA-1: 5bc9036b1667f44ca260073b8a2779d753cd080b SHA-256: abf8919bb4fb2a662e08cc72b94f543064a8c81b605e9ca6d3aaa37ce509e718
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://mxag.com/upload/browse/file/46311175178.pdf In PDF document text
    • http://srmtteaparty.com/uploads/files/202109011013591631.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/46588549379.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210903234815.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/mijoled.pdfIn PDF document text
    • http://fotosvatba.net/userfiles/file/26622160392.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c07e3dbb5---89273406321.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/zizejozaretoremi.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/011325296869.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32585771996.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/58189841018.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/65824580188.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/1245884049.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/jisabavodakaxafozajalu.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/8916242257.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/e2hebvmkmops395lp8qi867cs1/46558011376.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312fa7a7036---85429416277.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/wufexitizexuzumo.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/fepowizobafaw.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/ziduxovomejosizok.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909135507576242.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///jukodadafuted.pdfIn PDF document text
    • http://archbot.pl/files/file/19682271558.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/21670431893.pdfIn PDF document text
    • http://snft.ro/media/file/43321273640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=printing+messages+from+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_off0000bf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF46 10652 bytes
SHA-256: 79f1ce3c69748030895fd42aa6312bb1e4e8ecdfe498ea4b22dccbbd113731ab
font_01_sfnt_off0000d771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 17832 bytes
SHA-256: a4d1404e7f52a265051ccf709f99bf1137b22060f0d2025ac375ba6ede626216

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