Malicious PDF — malware analysis report

Static analysis result for SHA-256 799fdc9c0d7b6048…

MALICIOUS

PDF

121.4 KB Created: 2021-07-05 08:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a31459ff7944e037459c37886061a086 SHA-1: 7b5c0822911743b28f76974c55f2f5904c5994ea SHA-256: 799fdc9c0d7b6048f52596304dcb4553a093df5cf4716cb53e4860ad40739150
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and embedded URLs point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

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://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0ec7bb9844dd083a068307463f5d0813/nenalimilamarunaxabasibep.pdf In PDF document text
    • http://diversecityuk.com/userfiles/file/8378583025.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/0cf76e04862e9c704c0760885811e69c/44206123986.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/7f48876cbcc3d25d545eb3271086f40a/sefekobusigevufebowodusi.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/72787b7174f7df90442551eac21bebca/45586032890.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210507130515.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6107dda965---faralekilaxol.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/8a637a572ec3d70d500c110e8efb0222/jupaj.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/88579951311.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755daed9058---pevisaxa.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jejetakadijunewudazi.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160752a7c3843d---dudedimojivozufiteg.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/tinavenovofirumexojomolu.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/gurigixoxugu.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/zatizatefadawi.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/nitofarovunewezelotugos.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/85206523773.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/2f25fbff3643eec881254dcbda577dbb/jimig.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/tupuz.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/31ab252bd9269cc53f720de7f23ba774/6511205749.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/39184874356.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021061805470956.pdfIn PDF document text
    • http://dnepropress.net/files/file/zojefif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=snmp+extend+oidPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10256 bytes
SHA-256: 2ca4973bcece34fd86a8f0b68cb891835e8933cb1de955f514af8a85ee931e43
font_01_sfnt_off000107dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DD 52844 bytes
SHA-256: c6327053508901dd1d844e2e7dc4812d6125bf7e6891f15453218ae280647e5f
font_02_sfnt_off000190ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190ED 17776 bytes
SHA-256: f84c1a46c3cb5369a491fb157e249785dfe74c58a1b8102f6d7dedef6635bf70
font_03_sfnt_off0001c024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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