Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fbf7fee69f4d9e…

MALICIOUS

PDF

77.4 KB Created: 2021-08-31 21:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 082b97f9cc6aa0de401f9b585fb17abc SHA-1: bb08750edc2ba851089a22f25a4b801117c1ac7e SHA-256: 65fbf7fee69f4d9ea2a0bdaf55eec780324984b8324c5e982b1faeb9e36a2dea
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://sbs-group.co/userfiles/files/mudisedenitanemufub.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab183424a3---vapev.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8524835a65---gadediv.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/43232843295.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/2073255577.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160910721061ee---72399106904.pdfIn PDF document text
    • https://stopserv.ru/files/file/jejojod.pdfIn PDF document text
    • http://santabruna.cl/upload/file/69824304022.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jumokoja.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/linupakov.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/ximasixekatopugofow.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d906e75b4---ketepuratikelojob.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///30948859993.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16077712d8d78b---65885793605.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210528064420.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/76967793812.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/49110934897.pdfIn PDF document text
    • https://telenovella-bg.com/files/nudugixek.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/96167358533.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/19098052780.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/65736391590.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/90a659d6a635716fbbd868e1e093e946/jimotupof.pdfIn PDF document text
    • http://www.fotolia.com&#39In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ky97a+installation+manualPDF link annotation
    • http://www.fotolia.comIn 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_off0000cb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB54 17092 bytes
SHA-256: c90e25c95ad7496a6da48ed47c3c5a0a79feeb25a9d35ea90f1fb281a7dc6443
font_01_sfnt_off0000f79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 10460 bytes
SHA-256: 53144d3517bfb0a72fa1c7e28947341ed107e2bea0d61884d87f0dfa6186c124

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