Malicious PDF — malware analysis report

Static analysis result for SHA-256 a407a8e77c16f4b8…

MALICIOUS

PDF

88.6 KB Created: 2021-08-15 03:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12b58b115b8212e884f7e87b24a63ce4 SHA-1: 59a5f1e557acb0caf9bbf9791e27984949f42a16 SHA-256: a407a8e77c16f4b85797fac1f2a632a2bc79f2504c786880076aecc7a422ed4b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL findings are sufficient to classify this as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9695

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/f8e0nin1fijp7j0sdqfo8rkvn0/fituvitoberefivowuso.pdf
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/lovadulasujewiwexirazabox.pdf
    • https://celebicatering.com/upload/ckfinder/files/zisiwidomavud.pdf
    • http://thietkewebbacninh.com/webroot/img/files/38815669066.pdf
    • http://schs1968.com/clients/861610/File/98705374414.pdf
    • https://pergamine.com/ckfinder/userfiles/files/71358414265.pdf
    • https://bulgariapools.com/contents//files/1534074818.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f314b6b819---jebovugegutinovenoge.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/3c9ac1250c1fa39838909902b36e5077/24724647942.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/56dc9f97fa3681b9bf02e9dd7de0289c/53972163526.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/f1lgoda1vg56vb8gvl5bu9f690/93498618015.pdf
    • https://agrimal.pl/userfiles/file/saxusomuvofalosi.pdf
    • http://canxetaianhduc.com/images/file/35145114266.pdf
    • http://zetrade.cz/userfiles/file/60000694920.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/uapc9prk6vu8mc85ajlhfnvlku/tujurusuzalabazeluxeboju.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979d0d3e948---kudorenosepog.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fcngp18d9baf69vfmn7u2pm1l/44899378967.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5372251a2---kasavanazozov.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607269c06de65---xitovuzakuvel.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/29006164271.pdf
    • http://eg-connect.com/uploads/editorfiles/file///50552176611.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+behaviorist+theory+of+language+learning
    • 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_off0001012c.bin
8976d0267fd02556c58ae0405e1a625b65c20858b041d09ec05c5e70e4fc4398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 17152 bytes
font_01_sfnt_off00012d75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D75 16792 bytes
font_02_sfnt_off0001458c.bin
804a49771ae93669f363d65e29b448c80f012c717775c4a3c070b97b12a4f420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1458C 10904 bytes

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