Malicious PDF — malware analysis report

Static analysis result for SHA-256 838bfd3ded56c393…

MALICIOUS

PDF

89.1 KB Created: 2021-07-17 09:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: daec56a33f8f0e7b07a8e12546addebc SHA-1: 0a0777e1ab216d9bf9538166e34fcbe0d6061c16 SHA-256: 838bfd3ded56c393cf7d11057d0e5a331949b030dae2465d69a726492ca5ee13
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://pinpointfeedtech.com/ckfinder/userfiles/files/94826513588.pdf In PDF document text
    • http://thebestpearsonfamily.com/clients/e/e6/e6a49a9b6fa3fb0349b1957bd02e8b5b/File/88422227128.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/31051196146.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/limokip.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/7417981192.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/loririruj.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/52720453567.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vngud99sijppkf6j4e1fc2ju8n/xitevopibuxojevon.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/4514359809.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ed0e846897d73161467ad201db388819/wiritowisaguxozute.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/pawenopelogemiwefajesi.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/98994230116.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/vujisolosuzekomadaduwoxu.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/frnc0lu2cb6bsltvvefg991qg7/nisavuwozofenope.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160af81cdbe14e---21957447824.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a0f253a3---fakugobeluzuvorad.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/36672946116.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/86497300222.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/61123666604.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/2dd9b3b86e4f9f9195bb3d9bfc76b6af/zatem.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/l8nkilo9gfla6nlf59v0iesp09/rafodomixixi.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/15267934709.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608da957cc37f---tipotaxefanijuwonogiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=on+the+job+full+movie+tagalog+watch+onlinePDF 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_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 16932 bytes
SHA-256: a9fc0fc53f28fe3e853d12311f9d062a169f41d4f78b589f839a4fd3100084a8
font_01_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 11064 bytes
SHA-256: b4e2a8b34b8d05f43333e594435530c85d024fe5162cc1b5b2b007e5d60e3c5d
font_02_sfnt_off00013d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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