Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6ce4800d1d24f10…

MALICIOUS

PDF

85.6 KB Created: 2021-08-07 23:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4285457bef5ef778bda7b8a82485680f SHA-1: 1d58048b90bc13750180e803953ee34dc03d2653 SHA-256: b6ce4800d1d24f10c7f8be458259d71788b02312fa48e7232b1e51c716e8349c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to a network of potentially compromised sites.

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 https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3f7cc87de5ae4bee35a380e6bff7bda5/934245468.pdf In PDF document text
    • http://modellszerviz.hu/userfiles/file/dujorogibevikekezenikiw.pdfIn PDF document text
    • http://mankatomnclassof71.com/clients/e/e0/e0e8961458839910853a12af65841b27/File/91811465133.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa4b8873c1---nidumunagajanidijamasun.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/sitezoduke.pdfIn PDF document text
    • http://agro-partner.com/Image/files/95837101102.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/64073592844.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/eghrq4na05hkp47gp0fmchcon4/96786765219.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d083ac1ee9---40576217119.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/xebut.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/95783065385.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/riromepudu.pdfIn PDF document text
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/367706735.pdfIn PDF document text
    • https://xigmatek.com/upload/files/gofopizekixafodo.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/fece5b4330d346da2706ea8ee665a405/tizeregonexibufozo.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/85357058061.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160be31b115589---bavewasorig.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/14335095984.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/96960718411.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/giruraniximumeliduxerobo.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/pasesutefavomefojibinak.pdfIn PDF document text
    • http://adveotec.com/img/file/41226553235.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/41386c17717aef4b487abe04df9fbdd1/94510243170.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/miwefarixafodosuwopuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pixel+combat+zombies+strike+hack+downloadPDF 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_off0000ea88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 11116 bytes
SHA-256: 2607b7db85b1f326cf4ef1a1e9124ed0341c5910ba389a387449f339f3cd39ae
font_02_sfnt_off00011c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C78 16860 bytes
SHA-256: c89ad0633f8076017f00f90b0a5a5c8f3e13a5c502f801cf6c1074c1f52a9056

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