Malicious PDF — malware analysis report

Static analysis result for SHA-256 440341306528a4a5…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 05:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: bdcd5fec1ead0767a82670091b7ea01f SHA-1: 24669eafe2627d03e031103845c6387cd0f33cd6 SHA-256: 440341306528a4a53288a35275cadd7e1c22a9f1b9cf169fabb1b9f2f09a8fa6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to potentially compromised WordPress upload storage and other disposable hosting, suggesting it's used to redirect users to malicious sites. The embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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 https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/98619739d62b034698c6a842d62b7d14/reganesoge.pdf In PDF document text
    • https://avonsteel.com/UserFiles/file/58181360092.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/jezisijuxotakumiwoj.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c44afe8542e---40465008746.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2462318a17469c8188a29713c9f5a590/boxugafezeduf.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/52265138414.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/kevafewuverot.pdfIn PDF document text
    • https://bamor.org/userfiles/file/tedakalu.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/sizojunoduxaref.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/tuvejutaxalavaxavukubawun.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/janireza.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/51418593089.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/rumunawebame.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/zozipemiletapo.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/20573608837.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/db5625d2030312882d91252b75734411/93103065162.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/d38a793cb94cfd96b227ec28e377e60d/fimesuriziworamozabajul.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/jiledapixux.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/monisakiwipal.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3ae4435abfde5f3e5637014f0e7d0871/53432093991.pdfIn PDF document text
    • http://renovator.cz/files/file/78064091332.pdfIn PDF document text
    • http://starsunited.at/upload/files/jumijaposotubu.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/xavenawisosesibozawur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=simple+budgeting+worksheets+for+adultsPDF 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_off0000b810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB810 16408 bytes
SHA-256: 84ea0e7e8177a492ed58a0bf569eb5ff8e455e981921946a04e0b61618c379ae
font_01_sfnt_off0000e135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE135 11440 bytes
SHA-256: 651c6f436b1867535b41e04ada2f7e170ad56606921d2659778b88ccf8beb611
font_02_sfnt_off0000fba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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