Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf63ab195a4538a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 02:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ab6a2feb4cd2fe2015035925d320141 SHA-1: 55de1e207b11a0f906ab7a9242d366ec8cf91656 SHA-256: edf63ab195a4538a1f181d7c4ade65d52ef8abf8d2fab2691cb808c582385d4e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to PDF files hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of 'QR code redirect lure' heuristics suggests an attempt to trick users into scanning a QR code, likely leading to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://magiccat.pro/ckfinder/userfiles/files/xidudebarijonuzalekowova.pdf In PDF document text
    • https://sistemagestiondpr.co/userfiles/file/tanipizezedu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/57440623171.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f18be7e0152f0a6b5feee0552964521a/2994265948.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/mu2et210520r3ujr3dargo9oe0/mexan.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/bizebamori.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/rodixitenalukedowativ.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/27597045432.pdfIn PDF document text
    • http://wwsm-us.com/files/file/kupuwefomi.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/joninum.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/9052109615.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/xipavugosuwivenazovitiz.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/c5b0790226a31de74788cfa449860bea/79467124519.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/vupupegove.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613915a20b2fa---rukopedemobotafura.pdfIn PDF document text
    • https://smartmedia.ro/app/webroot/files/userfiles/files/zolibivezirezadu.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/71041800258.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/18883103117.pdfIn PDF document text
    • https://hinaweb.com/upload/file/65670261409.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/fukegokezekanawuduzi.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/57193343909.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/pazob.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/luraroru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+scan+qr+iphonePDF 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_off0000b2d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D6 10648 bytes
SHA-256: eccab8f1868b7b1559bde54a07ab85e4a61ce2a1117864068620843e1d602412
font_01_sfnt_off0000cb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB34 17180 bytes
SHA-256: b49016898e5a22caa22bdb64164deeef5121e262dd3696c11f1bce29321548ce
font_02_sfnt_off0000f6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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