Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff4a5553d06ecdb2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 19:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0116f2e299f34d0c52aa3505c6456587 SHA-1: cd5daea09b65fbb4bafaeb0a9a1621934a34d331 SHA-256: ff4a5553d06ecdb2f350562dc2dfd3c1160dc3503fdebeb2a51d6f1c40447314
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic findings and numerous embedded URLs suggest the primary purpose is to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613717094286d---75764230874.pdf In PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613279025817b---49402513411.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/sovuzudevidosi.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/bekunawikafovejinuze.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/27193465346.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/jopirefevunixoj.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/xojomuxoligetixefakonofed.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b129a38db---jevadidolotedirexovomevir.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/34013077858.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/safalivupifexiwi.pdfIn PDF document text
    • http://monteconsultants.com/image/upload/File/vuwenagiwatoje.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/niwulesuviravorenobaliwa.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/gixubawapiresitedavowam.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/kugokajarato.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/kefuroxumi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132610eba4c4---zifetagisoro.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/butem.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/voripibazagon.pdfIn PDF document text
    • http://ministerium.pt/files/bivetujubowevimimojofib.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/ecb4b4d191377dc5caa62c7a44488f04/tozik.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/sevewat.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/83057949484.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210910100655_829811078.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/jubosutafamitab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+text+to+speech+pause+and+resumePDF 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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18E 18096 bytes
SHA-256: b528797407dfd65e77dcb5c0b2a031956fc9e2d584350029b7117fcb2d2d861e
font_02_sfnt_off0001203f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203F 10916 bytes
SHA-256: 470f99178cccb3150377880b77807857b95161fa6deb0d512922d1dbd3c5e32a

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