Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc88d9053706e8d…

MALICIOUS

PDF

84.7 KB Created: 2021-06-30 05:11:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: daa1549cbe274ca097b74981f6f7eb41 SHA-1: e1908c1a480115b0036be6dcaf7f32a7b430a938 SHA-256: bcc88d9053706e8d18cafef627905eb974d93cd8d4ecd6ae3bfa3f4a07a13040
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to compromised WordPress installations and disposable hosting, suggesting it's part of a phishing or malware distribution campaign. No scripts were extracted, but the presence of external URIs and link farms strongly implies the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://synerhu.ru/uplcv?utm_term=hadith+about+business PDF link annotation
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e4ec7336c---91722175810.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160944a647442e---nufudosesadivigetewotuxo.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/eb0ikv7gvn7gl7e64vf3fdh427/vovonilijofodubavumonu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86d9a9ac28---zikopufudukonowe.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/20053410711.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/9eba83eeb56ab7aeeba9e64eb953cefe/65375703548.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608605f3e9a47---77169128311.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1e714d517---vufutijizafesenefosuz.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d54db6324---37763528132.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/xumifufujaxixuloz.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d291ee8477---fatexadavebitumusuvolavip.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/67239484779.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e3b124e5e---54163739223.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/31498467763.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16098086962195---39272651017.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/tefixivasekuxopaguxod.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dbc33178e---64148373605.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/2aed0a58e6370eac62e70d88491990ae/17971611589.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc544424939---50270855743.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/getopesu.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/pajiruremadukovez.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072111abf5b8---39846107566.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/34394428620.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_off0000e9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CD 10432 bytes
SHA-256: 0370943a158d1fa2bbb41cb8387fb1139cd04817dfad0e07948d1b4640c1d807
font_01_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 17296 bytes
SHA-256: ad2d934eaf2639e5f4d41066d6586cde042ad4867eed5a9b4ca32a542f6247d5

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