Malicious PDF — malware analysis report

Static analysis result for SHA-256 542dd81c383855f2…

MALICIOUS

PDF

83.7 KB Created: 2021-08-14 11:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 062c89192d4c9460c997c6aa79ee906a SHA-1: 84f664c48cc0c22643d651c00258b53eba4c029e SHA-256: 542dd81c383855f2e82d676b0c1459ee80f81d7d88f637baa371ad22703dfc60
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and other disposable hosting, indicating a phishing or redirection attempt. ClamAV and ML classifiers confirm its malicious nature, likely serving as a lure to download further malicious content or redirect to phishing pages. No scripts were extracted, but the structure suggests it's designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://refpecsbelvaros.hu/kepek/files/dapenepemubufuxazubuwinut.pdf In PDF document text
    • https://tenekedjieva.com/uploads/file/31498552602.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094977b470ab---85208526899.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/281g0tmq7hukp2eqgi0hsvj7ku/58203345852.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/80590584653.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/008cd89b50ba687252bacca654901bfe/rojukirurumexoruwo.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/62940960822.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/xoboz.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607564a83739d---28899452365.pdfIn PDF document text
    • http://lhs75.com/clients/46937/File/vaxezulasi.pdfIn PDF document text
    • https://landi-bg.com/images/file/bavikedotub.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a68df92e38---21329277235.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pigokedolufigusosolujow.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/7b87519f3b531438d34de2e9a2bba15b/balebujurujili.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/xonotozinotixogaxo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a67ce80ba---zifusubogutasepalof.pdfIn PDF document text
    • http://highlandhighclassof1962.com/clients/c/c3/c330a44b04b080977bf299ea430a317d/File/judubevegexofug.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/uilmh9tv6u2rm58l3m5cefq54l/47260856787.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d29d5bc53526e3949c8a16872d742490/40909567239.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3c87dbfa31989be14af977a10466574b/sagixodiwuzepi.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/73279369405.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/tenasufevosusexuzoxas.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/814055071.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0c6b3f667---62889572097.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/linogidilumujow.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160799269aa0c5---41623698447.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ejercicios+de+multiplicacion+y+division+para+4to+gradoPDF 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 18620 bytes
SHA-256: 6d7104d4293cfbc686b5b2452ff356cc661c52146c0cb8215a88fd42fe9cc613
font_01_sfnt_off00010d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D18 11328 bytes
SHA-256: 9fab9dfeaa02d392d868d825c37d74cb1a5082c4b7c108cfbe10d5da996075a2
font_02_sfnt_off00012791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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