Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f2e823dcebf5fd…

MALICIOUS

PDF

56.7 KB Created: 2021-09-22 15:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7a84ce1a6e6759132ddd78b750945ba9 SHA-1: afa46ccfa720897bc8d5f2f76f10dc9a111ed562 SHA-256: 57f2e823dcebf5fdf7e0560d807c0965a93f262d82f4cd79c30f66d9165cb572
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8195

Heuristics 5

  • 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
  • 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://wastran.ru/uplcv?utm_term=hell+of+a+night+travis+scott PDF link annotation
    • https://otterdisplay.com/userfiles/file/17434993589.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/29bf994a6e313f989fcdd6547ed63d1d/47089162975.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/zazawajegiwutov.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/digirafag.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/guzevuduwivesobududefera.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/59280074181.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/gilutagotez.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/tezumavagolilu.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/39470860491.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/23879431899.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/70862641417.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/bbe95972574a9938e48be6d5be1ed448/65046875191.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d88d4fb8a---gamala.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/43836567668.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/sawawupabeg.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/44784296894.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5f275a6b3---xezorixobuwuzaka.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/17763425761.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/59276231498.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/sedavabi.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/fokemokigekite.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f257529393---dowupiw.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/vavinorifovulebefo.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/9458437583.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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