Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf1fadc3ac8e82f…

MALICIOUS

PDF

87.8 KB Created: 2021-09-01 23:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 759ab6fe13bf9265471f4ed5dcd17941 SHA-1: 6b10b26f405f69721ade167c89880abb93171286 SHA-256: 5cf1fadc3ac8e82fbdbe7a612dc9aead81896184b91319a13918f07b896a29d1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on compromised CMS upload storage and disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders, aligning with the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://n-production.com/upload/fckeditor/file/xapekerave.pdf In PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/bivefisidalopifuzopazutu.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/597318256.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/jifavovapawo.pdfIn PDF document text
    • http://d4squebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/nonuduwatikilajoxidot.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/98db0377c519fe83c9dea04a34bf5340/dokase.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd7b4e989---21107584353.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/xotusir.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608222f3850e3---ridurozunisi.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/zaxon.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/35241673271.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085255861d98---satoxagamujizatukoti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128ee43b039b---44028034854.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/46387488164.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/44603138517.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/debofefaved.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/fozimebunitapijud.pdfIn PDF document text
    • https://majubesar.info/contents//files/fofemojumarawibipo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/kipigubiwuguvexuzofazomiw.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/52337772373.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/53813983637.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fd0169bc---9042703207.pdfIn PDF document text
    • https://etimes.mn/uploads/files/juxovamoxunowi.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/31375404920.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/fujetowijokiwebufubere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=oh+lord+buy+me+a+mercedes+benzPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD9 10884 bytes
SHA-256: a880e49ad9f4509b99df1eead8e22a846bd24caf1be118184f7e267d54d6c459
font_01_sfnt_off000105e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E0 19008 bytes
SHA-256: ac588910a20d0dd914567a0e55c172f8b7c14a834cb38da70afb7dc1ac0e2998
font_02_sfnt_off000137e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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