Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c6bade63a665d9b…

MALICIOUS

PDF

105.7 KB Created: 2021-07-21 14:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dff44f9c6f6a1ec4039b4e12561f9227 SHA-1: fe8efb0c624b03ad7e3d0c66b90b524b8cc39905 SHA-256: 1c6bade63a665d9bae72922f1758d7612e727fe07d087710dcdee1483d68aeb5
204 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing campaign. The heuristic 'SE_PAYMENT_REDIRECT_LURE' indicates the document likely attempts to trick users into changing payment details, a common tactic in business email compromise attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c649cc3fbaa---74476515401.pdf In PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/valukiwe.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/gufasujo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5606caaf---julowubitoz.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/g48o9cnle0tv809klg1bl8ccnf/83764079945.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/70578974350.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8e660d776---38104015786.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/8e3c3af3bda1d57b3c9d172f2dc30074/62536012347.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/56764379310.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/tewupaponeferapowuramed.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/pojikexugeviji.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99cc43686a---ziforido.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/877d9e4977d4dde583179dd0ec0fc8ef/zivudumotadeki.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021630103164693.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/1eaccb802b260f641a78a2eb27623f3e/ganuzopebeloloxufim.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/niligakazivawojukudujuz.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/6715585255.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c57bd1cc367---nutawajokumufugavujul.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/mevofadugefajotipuzuki.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b93b7abe---mapodonezawukojategago.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zunowigaboxavotibomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=art+of+war+chaptersPDF 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_off00013bc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000153d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D6 17244 bytes
SHA-256: 5181c77584b8f07c77d8c1432bee4025ede0ab63209f182cc477260fc7fcd205
font_02_sfnt_off000180e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180E0 10404 bytes
SHA-256: 8751d6dab505362d7eaf958974441d682e9806db43e34fa3f936b326b0769560

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