Malicious PDF — malware analysis report

Static analysis result for SHA-256 6512365d700d3886…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 03:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 787a947beda22a9e5e91b97f2cfc8214 SHA-1: be0eb2e169d55c4e3e02999502056b76a34527e5 SHA-256: 6512365d700d3886e40aa71f8216e27ce180d71c275d65f63b4725625bdf9781
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/12207843943.pdf In PDF document text
    • https://infiniteprospects.com/FCKeditor/file/19507115916.pdfIn PDF document text
    • http://budka39.ru/files/lefaforowafu.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/jijuvarimisaliwofefe.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b2a4ce077da833dff5333b095904d9a8/lalisubinefurorem.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///67707102568.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/84247686264.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/fobepugupikigebivojovu.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/7453950001.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613847adaf12f---36043322410.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/6982261770.pdfIn PDF document text
    • http://surinmajestic.com/phya/ckfinder/userfiles/files/73535724451.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/54563706585.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/kerujibenobamez.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/afb8b8f67e8503ddd3da0c4fb3eb0423/3961596056.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139bcc9b4196---20726962826.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/15368977026.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614b75687a150---13666974717.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/51550424776.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/geguxa.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/litinigumasibodojum.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/43123603446.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/63260582449.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/65133385691.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/38581712779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+have+iphone+emojis+on+androidPDF 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_off0000b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 10884 bytes
SHA-256: 180d95a59bbcbe4a2723ce0f5a9e37ed84441ace915820b6ba81a39bc9c02958
font_01_sfnt_off0000ca4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4C 16320 bytes
SHA-256: 3db1a9dcb56e890cefdb0a056b8d5a8ab5ddee2da199089d2650e96fbb971933
font_02_sfnt_off0000f3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1