Malicious PDF — malware analysis report

Static analysis result for SHA-256 11ca3475dd07b8c5…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 19:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f70847023d80251eb9197d53825c746 SHA-1: 18da3f649647bf629c2dfcea69fb3ac8c7c48608 SHA-256: 11ca3475dd07b8c5c53c18c7b28c435538107870d847a2fe7402433aa707da7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous URLs pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6362d8ed65e9bc70e3ce0bbd542fd168/pojabun.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94d9a2172---kovaxev.pdf
    • http://networkinglikepro.com/ckfinder/userfiles/files/6953912541.pdf
    • http://puzynowska-kancelaria.com/userfiles/file/14917845266.pdf
    • http://woodwork.pl/ubezpiecz/obrazy/file/67512591965.pdf
    • http://ipmarketing.net/userfiles/file/getukuzevives.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d70df78176---62924222896.pdf
    • https://dusunceokulu.net/resimler/files/27261681655.pdf
    • https://oumkua.com/userfiles/file/96739011807.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fk1dnrf9nt2qudjo2j8ebp2bt5/93612575763.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e6195886580312d4ee375be596768bc4/kegupifur.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/daxeseganodomoguxefemuxo.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4b92de4cd---64958307923.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f697245a60---53639579186.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b6cd8be24facaae8b1d5379b8b3720af/33974719526.pdf
    • http://szpk.hu/_user/file/83743401893.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c70d7e02fa356736436f16a99fead357/48901057005.pdf
    • https://faprosid.com/file/91777740394.pdf
    • http://churchtextile.com/userfiles/file/fomaledavot.pdf
    • http://animalscipublisher.com/files/upfiles/file/65169253748.pdf
    • http://esipro.fr/userfiles/file/7785131717.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088fc431cc9d---wunupanomupaboxufisaxame.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda475d137---25059503290.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160933b509acbe---93555292643.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607651c81ab75---63804769755.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+pop+a+burn+bubble
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebfe.bin
c7fcfba74ce7af52359c8f03d78519378bb19a9f4ac9c8f662ed84d8a965c89e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 10304 bytes
font_01_sfnt_off0001031c.bin
9fbb2a9315107133d62bd92cbc9a224b197070c29b3c1aa373daee764fb2dcc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1031C 16504 bytes
font_02_sfnt_off00012dda.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 16792 bytes