Malicious PDF — malware analysis report

Static analysis result for SHA-256 e71751ed11fe040d…

MALICIOUS

PDF

71.2 KB Created: 2021-10-03 00:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 76581450ad8153bca6a6a8c1af24d43d SHA-1: 9af76538ac2ede7adfa0bf6dd3f1480efc239816 SHA-256: e71751ed11fe040d0e80ee702b8fbbc0f8487f6c1ae3259bf26eed96a52206c4
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 WordPress sites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://kibledergisi.net/resimler/files/68895580467.pdf In PDF document text
    • http://batterseataxi.com/survey/userfiles/files/goziwokexofel.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/junexa.pdfIn PDF document text
    • https://tmtteks.com/files/kodegubezofivadefe.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/31792bf25a964ce0a2ed723fedbcf92a/16685008912.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/m5nuke6u5tc7sci95rgsk8p2t2/tabuwupewilirisofavi.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/naxutosulofo.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c6228904---62781094997.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/jijunijajurawobujokure.pdfIn PDF document text
    • https://onecre.com/images/content/files/82271348692.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/93238821678.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210926_E5DDAA11365C28CD.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/62939708299.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/67381417712.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/kipinexarawuk.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/79623399163.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/nejovapajuruzilisunabibup.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/96198328256.pdfIn PDF document text
    • https://breedlife.com/upload/files/texagawux.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/2671655076145a38dc9070.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161529daa80db3---70028615456.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/faguba.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/nogad.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/39247390364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=refeeding+syndrome+lab+abnormalitiesPDF 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_off0000b3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3EE 10996 bytes
SHA-256: 0889e966ad93f2b0d75de828eb3821d6ab029bcd0ce43d399c9de0febf5cc41b
font_01_sfnt_off0000cd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 16252 bytes
SHA-256: 09580794665777815be3c26dccb516a0118398c576be44fe3426ba831e259a52
font_02_sfnt_off0000f6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1