Malicious PDF — malware analysis report

Static analysis result for SHA-256 727cc1e9aebc08b0…

MALICIOUS

PDF

91.1 KB Created: 2021-09-07 16:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 506ffbde600c4dddad484acf363007aa SHA-1: 96a4696ece5a8535fbc3bfb32984b32858cffbcc SHA-256: 727cc1e9aebc08b02f78c0d8a12e573846879e7b9e55220c12f482648b61b6c8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, 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 external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://calebdobe.com/clients/875189/File/wuwagutu.pdf In PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16127b697c3018---82892912851.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0acc35c0c---kizefopenigavofub.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80629b903d---44005996319.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/46650285871.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607474cbd3078---85804984382.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210511195513_53035670.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/wefotujaziboru.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/36492291646.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/75491854829.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161215ea0cab61---lukonebesifodaxusizuda.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/57137651991.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/95545034237.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/samajezaxasijuvene.pdfIn PDF document text
    • https://raljob.com/userfiles/file/71180994844.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/76548269387.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/84221189190.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d30716e7c7---losidisufarutuzuguporesu.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/29979990068.pdfIn PDF document text
    • http://lumieretvie.com/userfiles/file/vuposir.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4260325470938b458e6db60e17bb8f16/makoj.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210528194837.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/39330743235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=parts+of+speech+worksheet+pdf+with+answersPDF 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_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 10852 bytes
SHA-256: ab18b781a5261be3c67abb9d6fef7baa9312bb98f8000c982a0db02c6e6485dd
font_01_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 18364 bytes
SHA-256: 2e82e4c355eccccc187e07e658d5e09dea5e4787917ca4a1dd343e00efdfa534
font_02_sfnt_off00014664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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