Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6db487ee5cfbd0…

MALICIOUS

PDF

70.1 KB Created: 2021-09-15 06:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3109edf0fb515c7a35854b768597c5f3 SHA-1: 638b5c53dbc2c113cc29a7eb8116fed2e500548f SHA-256: 7e6db487ee5cfbd0d65606930a022f0aed7feaccdd289a5d544ed30c3d5c81ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs, many hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://3mfa.com/images/editor/files/nemigiro.pdf In PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/45686341739.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/df53f9e92af7f1332aea678d9069a4aa/bikenikiwerexamira.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuwopufunu.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/47237802426.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/tavesopakomudenereredumef.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/miloj.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/wuvefakadi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/47841880731.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/julofigofam.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/tiloro.pdfIn PDF document text
    • http://afslab.asia/upload/files/61544582666.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/52082538721.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/govebata.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413810cb11c---juguboguvezitonog.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4809749ad---18144307654.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/69209158831.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/5459743291.pdfIn PDF document text
    • https://chsins.tw/uploads/files/202109061224022092.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413dd98144b---zenafutegaf.pdfIn PDF document text
    • http://electric-kernbichler.at/gixuzexilovizasijezat.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xapenovunekukavonifogunoz.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630950384_a7ad23a030.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+put+address+in+a+letterPDF 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_off0000b3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EA 10564 bytes
SHA-256: 44fee84faa00d72684246aba17a1bee3d42422cc583c96b425ac2a0168e310ec
font_01_sfnt_off0000cc23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 15252 bytes
SHA-256: 8851f7555ce522cc1d24caf43badc34f70e325da4ff2699354769965603fbdd2

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