Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65ceb6a76b25a55…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 03:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a78224c1e1d02cc416db683f34e784f6 SHA-1: 5e35fb57209ede9380961abcb421eda5242c1b3c SHA-256: b65ceb6a76b25a55584bfdec307f82dd9f2c528519ec09de1941f68458550dfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for distributing further malware or conducting phishing. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common PDF-based malware delivery techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=westinghouse+50+4k+smart+tv+manual PDF link annotation
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5c4119503545d729c4aa9306cfdd8ef1/dovofuxamexoselewuxegav.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/e489494387a4c146031041a6c53221b9/90641882992.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/godowixonajovobenarodu.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210629_4737D568A1F86FB7.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/21668704945.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/238bf7aea619abe1a035bec1d3b40880/68450086419.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/defanekegebekeveribati.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089958e3777c---jowigududusafajazatitudut.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/af5e452dd294b381a2d82a8b4bc9f8d0/tobawuj.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/t2ss154rjr3mlmq63kokk8ev8b/79631797440.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/4966320657.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5c64ad01d87e9a5eab697c597b7b3e16/68541769477.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35cebd79e---zovuritapumijabumobiwi.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/temaxadonetilif.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/75757711004.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/vawitimideseduri.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bee8f2d6c9d---26359728709.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/fosifigijilosagot.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c59788041c---wevemaf.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/jomis.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_off0000d8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E5 18772 bytes
SHA-256: 56831c2a20d4f47a371c412d0c60fbf5b6ee98ad046eace85dc4113ba0f27553
font_01_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 11140 bytes
SHA-256: a37c76abb474ea135f9ccfbdeac5ca63cc2586cdb64a3ced3c2abe84cc721144
font_02_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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