Malicious PDF — malware analysis report

Static analysis result for SHA-256 50edfddd45e564d0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 04:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eca83ea586a99e7a5e439d6577dce2d0 SHA-1: 4ddc14b8d6d14672a2555707d65e10146c323a50 SHA-256: 50edfddd45e564d0142ea191a98dddde99b16ccc651b42d4e379cebf005f17b5
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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
  • 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://clinicamanila.com/ckfinder/userfiles/files/genut.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4399e09c01.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/9923266446.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bada33b3c8b---xifesijavadeb.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/32bk2iqlan3surkdbq8ud1ei4b/30497171241.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d83e0ee175---40849400369.pdfIn PDF document text
    • http://ledson.ru/upload_picture/88780881748.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/79940550799.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160874b9f8da49---pofikekowujogoluxoradoli.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/7778414601.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092432280e1b---megadixix.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/442e36a88f5583878a484890486ab733/87214169239.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/b8bbflb0h8o48fiqt2brs9bl37/wufurogovojesejutizubase.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/464bca95348352f0c7357e06088c7e02/kavuto.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/90e140e4243e6af09e5d36deb2636b7c/dabovudikiwagufukodujag.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/nuwutage.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/vizagokuzabojageduzaf.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gajiso.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/88333135171.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f6cca13ba---fabejaxokexekomujinajil.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/57603319414.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lisekimir.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/nanimugonize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=inductive+deductive+abductive+reasoning+pdfPDF 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_off0000ddc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC7 11004 bytes
SHA-256: 55d67f61ccb778fb3ec36f76db85b4a7f13a977f269e281be267b3baff3e7248
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 18008 bytes
SHA-256: 84cc7a300c63165e5acb11307e2049e094d9533bf02a5a542dff5ed8ba700f9b
font_02_sfnt_off0001258e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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