Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b387237e034f10…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 21:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cf4c861f55c026d0877f1b6d316e9d63 SHA-1: 96de3651e01462b861b26a9a7448d062ca21e416 SHA-256: 97b387237e034f10af92ffe18f6b8cb10f412c99068929c801f2f81cf94cbf23
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, including one pointing to a raw IP address, and heuristics indicate it's a link farm on disposable hosting. The presence of a 'download button' lure and the ML classifier's high confidence score suggest a malicious intent to redirect users to harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=videoder+app+download+2020 PDF link annotation
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/rojidusora.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135837130054---rolivitiguzigo.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/98137283548.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109010549358110.pdfIn PDF document text
    • http://glassick.com/userfiles/file/86926394029.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/26819015532.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/rijuzokenexaweroxoxulofuj.pdfIn PDF document text
    • http://www.orthovision-lublin.pl/ckfinder/userfiles/files/tubetibafikinotus.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/1241235bd137dde8c9d284301d3076d0/vuwasoduxakizoder.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/nujobodenejim.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/56044411908.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/kinopebim.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/mulifinadimujemo.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/jowitaxuvoxixubemudizesud.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/19300236271.pdfIn PDF document text
    • https://exihomes.com/userfiles/files/fafobunevuzuwezesu.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/sakuwojuriwex.pdfPDF link annotation
    • https://malashealthcare.com/userfiles/files/55820812289.pdfIn PDF document text
    • https://baongochoa.com/upload/file/74989147014.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/10161907959.pdfIn PDF document text
    • https://artenika.pl/fck/file/buwuzosos.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/4689585908.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/kedep.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/85469854782.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/60d3697d8796500f6bbccb691cedc2f3/xibiwegubopinutova.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/4410699922.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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 17160 bytes
SHA-256: 885805863c1f2804857635f6ca7627043acabb3ecf5a7ac975c6c1c3495851b5
font_01_sfnt_off0000f89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B1 10416 bytes
SHA-256: cf16c0c575d13ca2aaca7cd41f38c7bb05acce7c7054e6f6e5c0281b4fc1de0a