Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb63cc3f697bc52…

MALICIOUS

PDF

84.4 KB Created: 2021-09-05 16:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c9f10f2433cc0b3fa25418f68b7ba2d3 SHA-1: 13a8cf1ce8c8c64576164f0a9fc2d31512bc373b SHA-256: bdb63cc3f697bc52ed64a28a1b93de3db2ecb95dc1729ec54c9f7f88e7d760d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic firings indicate a pattern of SEO manipulation and compromised CMS uploads, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=rezultate+admitere+academia+de+politie+2018+pdf PDF link annotation
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815c878341b---semogi.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/vodafekexele.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/sewivalikarawuxo.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5fae2581f5---kumozosajizorela.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/47953051829.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/93639523910.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-16/20210516085359373620.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899fac2e15e---71721950714.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dm4uag53jg4av1j7pi6g5jq9h1/vugigoxugixatazakuni.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/22768121193.pdfIn PDF document text
    • http://marymo.ru/uploads/files/77010012071.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/82017877087.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf3f999782---bivafi.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/40053042356.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/65107799734.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc181607e0---zexiv.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/80825048896.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/zalijodiliwupobu.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/58206149857.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/57247075486.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/junamakatavipa.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160910520aea6c---41891973349.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ced67b9510f7201d4bc493821ac59228/76487759984.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_off0000e37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37C 18504 bytes
SHA-256: 7a5ded4f588fab4ac7e7b81ceff37edba90f9880ca4c672c32534ab3f5b05a6b
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001293c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293C 11216 bytes
SHA-256: 8a83f10963a3c5c5405999dbcdde755fafee76b29583da2729cdb5e6457983f2

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