Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff60d550f7768ed…

MALICIOUS

PDF

89.9 KB Created: 2021-09-06 11:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42382303b620394bfe3066b2180faeb3 SHA-1: fd28edb6c95f4406729cfacde55007b914294149 SHA-256: bff60d550f7768ed400a05534289f3ebee066632436ebbba533b1da9941d96f3
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload directories and other potentially malicious sites, suggesting a phishing or malware distribution lure. The PDF structure itself does not contain readable content, but the embedded URLs and heuristic firings strongly suggest it is used to redirect users to malicious hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/56924ec12fcb88af15ddeafe3caa40d1/palepubaxiruxub.pdf In PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/jimori.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc682b3f1---fosur.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e63cc2994d9---jokofud.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/39086273982.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6uuof6s7433t82bibfmb83lnc4/66561000342.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612949d4079ed---40000735368.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/f1mcg1k0pocvl9t6nqpf00eect/11805114229.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/b3738a06aa4314a067119d9a719bca64/gabena.pdfIn PDF document text
    • http://grandfiltr.com/files/file/61986115327.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7322127da---kixefogirateparubum.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/ragofiwelarunumiwe.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/zazuronijej.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/sifaladefavaxibizeboge.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f372df17c4---rusobiwamodozofaj.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607120e04e6b1---luzaf.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/jatemotite.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/3558649034.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608988fc7ca2e---vagiratavoriva.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4940e692ff---14276430567.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/76579609936.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16109df4901a89---kerikedalezi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e62465e26---28832025991.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/68904785144.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=attach+pdf+in+powerpointPDF 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_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 10572 bytes
SHA-256: 086c989ffddaf519d845fa260540d8b532a3052f259f8e562ab8c0bb2cfd8d6f
font_01_sfnt_off00011244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11244 18216 bytes
SHA-256: 139dec933f20aaa3316b7274daa84f7271b3430f75f647d109f07d4971905b6e
font_02_sfnt_off00014196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14196 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.