Malicious PDF — malware analysis report

Static analysis result for SHA-256 94b1771779a7ceda…

MALICIOUS

PDF

79.9 KB Created: 2021-09-06 17:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a5771db85f1a7c38f0eaea80f7f7a908 SHA-1: 5cfd9de61c8b656c92aa3b4a43c9bf31bff0fb63 SHA-256: 94b1771779a7cedaf8ae5a31aeeafe66ee08a623b2e7b67d8993fa9a35d1bc93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to multiple compromised websites, likely serving as a lure for users to download further malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612de40957bc3---gurigapiratiwaposera.pdf In PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/28f29f5946a9879157be4a75e3957caa/59762278761.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/32388029568.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c061d748f2---91954204029.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6601c5a33b---53425652171.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/97620180412.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16133404084a7b---jojiputiwamufopevosapole.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/17377482968.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/zozeduzusabebunaxilijukop.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8c56247630547159bbf9cfb45077c45f/55921718021.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f1bb731db0edd0ac397b284511b88fc8/57631691358.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/puzukala.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/u3n30igq6r97jvnqi62eu28ebo/14200382992.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/gidozuxodales.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/87f8fe4e72df828212295548ec0e7c19/fafarekusefidamaj.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/zotuk.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109060943094059.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084bca9c295f---47193424290.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/65472987092.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/zukudituxomexepe.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b42dfbcc9d---57436183763.pdfIn PDF document text
    • https://dgaspcsm.ro/ckfinder/userfiles/files/dotekirogej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=kinectiq+air+manualPDF 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_off0000d474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD474 18076 bytes
SHA-256: 19e36979eb96bb809ce50e55f1cf714db9f25178215112bbfe1d93852a9a00b1
font_01_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 10340 bytes
SHA-256: 1994dac47d6735de2ac80e6bc9e2ff9993b58f613ce869690e975406dcdef091
font_02_sfnt_off00011acc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1