Malicious PDF — malware analysis report

Static analysis result for SHA-256 95507041ae4c79a0…

MALICIOUS

PDF

83.9 KB Created: 2021-09-08 15:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8137a246ef1440776a31e2a8246805ee SHA-1: ca6e4295ee38810908270735bbc166299bcddb58 SHA-256: 95507041ae4c79a0629747cad7dddbe95661e9c3f3008d8b1257b3478a6f95b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites hosting other PDFs. Heuristics indicate this is a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://racecross.com/upload/edito_fckeditor/file/vunirafamenadu.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138612188117---beremusovef.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/dalitinigenudirawomex.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/rusebazajexefemiralava.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/fudufofisinavaguxen.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb499f2fe7---nunoza.pdfIn PDF document text
    • https://asi-filter.pl/files/file/weremezovol.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/funid.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/tinefodufugodo.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210905115310.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/80376723544.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16135e43fe4228---migukuvumuta.pdfIn PDF document text
    • http://sgo-bage.com/public/files/files/zawuzebufan.pdfIn PDF document text
    • http://www.ximangsongthao.com/app/webroot/uploads/files/32300838724.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109031911313566.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/8583753179.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/putotowimuwapomugowamesal.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/votetoxow.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/bokepizexezazoxus.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613298aa6775f---gewanozixatowiginixifi.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/69177302581.pdfIn PDF document text
    • http://thevale.us/userimages/18885344566.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/75536438015.pdfIn PDF document text
    • http://heureka-cz.eu/files/zelute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=simultaneous+equation+substitution+method+worksheetPDF 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_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 18376 bytes
SHA-256: fc00d07d5b7631f46f16956aaa2edfd843e6fd52d08679c4577048d027ac896a
font_02_sfnt_off000127b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B4 11152 bytes
SHA-256: 41e3739449f4f7aa3f39a04df3a7474720771eebcd1eab012cf5a80b22f13c3d

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