Malicious PDF — malware analysis report

Static analysis result for SHA-256 901c9d6eed9d007f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-20 14:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 90f3798a1da57e48ee1b035d6380e2ee SHA-1: 79321eb58efcf365e101090b898815da721055d9 SHA-256: 901c9d6eed9d007f2763d81a27a80e9d07f351e31d17bbd183888e953698a954
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a link farm pointing to compromised WordPress uploads and disposable domains, suggesting it's designed to redirect users to malicious sites. The presence of a QR code lure further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.bankkartya.hu/js/ckfinder/userfiles/files/52030978178.pdf In PDF document text
    • http://bebsulmare.com/userfiles/files/wururawetakolozeg.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/37204432414.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/madudamuxejowo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614378b152613---kinodugepogojazofeliril.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/84298217591.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/zofevolalewupomiforelumi.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144ecfbe168e---tanozijuvunusowasazage.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/lepulimiwuviresuj1631323121.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378b5b3d599---dewajafejawuzafufif.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/gajujubiri.pdfIn PDF document text
    • http://deforma.it/userfiles/files/zovidoxomologuvuvitejisus.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/38288350630.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/51327172235.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/53977139932.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/jexazixuvodipenoxifuri.pdfIn PDF document text
    • http://worshipedia.mobi/sites/default/files/file/mivanomasefegepa.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0905/3011f22e2f7385f93963e59d1c9983f1.pdfIn PDF document text
    • http://zuche0551.com/upload/file/49573961757.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613504501a9a4---zaxerosowananekavarirugef.pdfIn PDF document text
    • http://onlinevay.com/upload/files/90053783505.pdfIn PDF document text
    • http://pasted-radio.de/web/files/50875727075.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d72a392bf3---nazubodabo.pdfIn PDF document text
    • http://arucax.am/user_images/file/nusowizazobodaravazip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+see+registered+wifi+password+on+androidPDF 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_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF062 10704 bytes
SHA-256: 2b8b5c3259414a3219c3020fedd1818cce6ffee3fd896399545dc636b44989c6
font_02_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 18172 bytes
SHA-256: 08cb4802c4a93427491dc6a446e5c69ace9f0ad6a46cec7b5a3eabe7a23abfc3

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