Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9611bb3718099cf…

MALICIOUS

PDF

75.0 KB Created: 2021-09-04 04:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5427793471390588428ab4d659fb894 SHA-1: 800d8a083052847f32c982ca8290c04f03af9b33 SHA-256: d9611bb3718099cf34f1e027d3cbf4a7db60b7143fe0f5c0260ce905a3e0e66e
156 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of many links to potentially malicious sites is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://chcial.ru/uplcv?utm_term=fish+tales+pinball+manual+pdf PDF link annotation
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/d7ql32oq0cbjsin5agjd4bnk74/zeguwezetoneripe.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/58141032161.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612cbbc784dc0---surumewuzozazi.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210826150049_9r6xlc.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/84bf95b1d31e98a53a45126ecc828b6f/35027759622.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/56659214242.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a663c149bd0---84340869763.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ded95271a03---wubasenawowarim.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/16636151606.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083132a6dda3---futalosidikiwosar.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/kamaxujataka.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210523040958748.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/98120749637.pdfIn PDF document text
    • http://hchs1972.com/clients/2/2c/2cb73362227bcfbd3ed6ae01b5b3dc46/File/21567171420.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/vegalufavosotup.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/podekoboxapenusebo.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/76a6051836a8310506cd60fd307b819b/ragadadiwagamuraz.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/28566797064.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078fd89163eb---15086731199.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021080721202730.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39319998373.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/28732142202.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/70686658918.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/5b9t20n0i8lo9t6lk86ol3vtl7/movifuguwovipan.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/gorowaxatig.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076e680cd4fd---43209083005.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_off0000c0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 17336 bytes
SHA-256: 0aa787a75a6476105f82a5ed9f1c1760dbded253059650f063f95ac60c64a5c3
font_02_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 10760 bytes
SHA-256: e96081a4ee87fadb9ac32f8dc5b82a6ebfed4ba3660cdf0b625f9bbe51001c95

Open this report in the interactive analyzer, or submit your own file for analysis.