Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ceb3ae0fbba4fc0…

MALICIOUS

PDF

85.9 KB Created: 2021-08-24 02:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5874b1c352acaedd0639baf919640781 SHA-1: e3344dd7d45702e9f3dbb55f103d89208afbacdb SHA-256: 2ceb3ae0fbba4fc08007778a63cd1a6a407e5764fee2ca401cdd404f577c9809
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/uplcv?utm_term=truthy+values+in+javascript PDF link annotation
    • http://nessium.fr/userfiles/file/34224000668.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d056af8bbfc---gojogalizexidisuzoxewo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc6b40e2e94---21432362586.pdfIn PDF document text
    • https://polaria.cz/images/file/zapugibojamakizenazudoke.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16102b4c8b44a6---97501895670.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2ab563aa4805e1b611c15312a010cb14/92112995420.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/xisutesives.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/62166540496.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785d36be932---64491141454.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rimedaxapesimobazefo.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210615_E94E889D99C3D5B5.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/95680092106.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/bebekuke.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083249888311---83202782757.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c518da2710a---zaluxanerel.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/40093474379.pdfIn PDF document text
    • http://lukinserv.hu/file/zoxevokufulufonutet.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/77478528783.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/38017218300.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/37282009013.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/xuxuze.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/79646376316.pdfIn PDF document text
    • 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_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 16644 bytes
SHA-256: afa66edfaff84588e7ca143edafb5c56fd1524b97783db8db617af6088f27a32
font_02_sfnt_off00012fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 10724 bytes
SHA-256: cba700ee90bec473e3190c67b5854d67bb2030f7b64b45e6ed05faa055578c1b

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