Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb532f1fd1aff75b…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 18:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 01f6aa5dba3988c1849f2a8b8bf28f2f SHA-1: 7ca1cfdee89594aa00e5a2a7ea01c03441ba0f3e SHA-256: cb532f1fd1aff75b779a8fe86b4e37af2031150ccb3f2620a51f1cff89dc5667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm directing to multiple external URLs, with several hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://escrima-rlp.de/userfiles/file/baxamisipoxesosobefa.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4db9869a---40117210683.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/nokadirovazuwizagezum.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/lirepexikufajimajegekam.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/nuxoseveja.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/20c27baad72e44b0e6462c3101cea513/fedib.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/30736551396.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/fezelixobagurowukigop.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/11062538955.pdfIn PDF document text
    • http://nhs-carpediem.com/clients/46367/File/42807092141.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7b4201b3---lepipowadug.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/24420328811.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/59467998619.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/jotizudobo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611db248a8f87---wuvetikefedimoxigipogase.pdfIn PDF document text
    • http://winso.tw/userfiles/file/kilomelufavusimifibevud.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/50353733160.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/71510240483.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021073008412865.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/mopizimenarizafopozakiw.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d3a2c64e---fedujesunonuxe.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/45371021829.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9dbe4a5158b054c21af81734c4aa714f/26413180193.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a28c0ac2d9a---10273197940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=2019+mini+cooper+countryman+s+all4+owners+manualPDF 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_off0000cb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB91 18476 bytes
SHA-256: 1cab9e1b7916c2d730d4b0ea0a84c71d58faf537a3a40e9e278311447f51c98b
font_01_sfnt_off0000fbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE8 11280 bytes
SHA-256: 747f9620e8cc862f78e3c5f5071f9f727f92dfd17c60119857c9fee5d8bfd666
font_02_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1