Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3d52cbd80d16d3…

MALICIOUS

PDF

140.7 KB Created: 2021-08-01 10:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 725cddd7f8d403f4a660f762110ea6e3 SHA-1: 53cc480ab189180975bdc862279c02f618655a78 SHA-256: ec3d52cbd80d16d3d604493df4cd6dd083906239ddbeed8d21c5197356640eb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript for redirection, and the overall structure suggests a spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/la5mclaiupmchdngtjpg950mu4/fesabopasisusamivepijukeb.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/8soojh0o7peiedmos47p1dqch0/baxazazurazizizekedizile.pdfIn PDF document text
    • http://technocom.pl/editor/file/xigexulesegadu.pdfIn PDF document text
    • http://becucci.it/userfiles/files/4973643403.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/nkboah16ai4b48rgc3qa8efrgd/73687770291.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/nitirokonunafelojetaxaru.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad23577fb76---6391312904.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a216f9a96b0---58154515514.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/7l2ruo58tesbat3gf2jg5r5n2o/12526591420.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747ee0921e9---jibufur.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/16268621709.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///97001437751.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1186479d0b---wefumuwavapitixu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3d6a3b370bd2a832e1d952eb965a9d7a/20130816931.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/julijodidefumiwupuz.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/onb9th9b8snhheouub71hbh6f6/38111689881.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160867b9eaedc7---63930318080.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/88863573644.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160935b2f47f8d.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/79479265710.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/xavobodinun.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd374001cd---15216955808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=juegos+de+pelea+para+pc+pocos+requisitos+2+jugadoresPDF 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_off0001c2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2ED 18768 bytes
SHA-256: 639a618987f512edb7a718467410fa58973800f45bae9d26b66e40ee8e9492e8
font_01_sfnt_off0001f2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F2B6 11072 bytes
SHA-256: 801b097c3dbe64b2bd5e540f547c015896cceefd294387e0ecafeb92783b4d4f
font_02_sfnt_off00020c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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