Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb87f82c6bbe236d…

MALICIOUS

PDF

96.7 KB Created: 2021-09-04 16:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ccf20d44bcb0334cfdff309206c17cb SHA-1: fac17ce7423f3df2ae35a2ee253fba8f01137831 SHA-256: cb87f82c6bbe236d1f7b6f898f9626b0110a55b067b45d0c28e5206ba569645d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=public+administration+books+pdf+in+marathi PDF link annotation
    • http://3e-recycling.ru/app/webroot/filesfiles/manoxiz.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/tubunosodapem.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/gqd3ufnfarl4t47g45414ad24h/desimuxafa.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f8f3ba298109c2c653e008c245079d4b/lovegotitiwazibezo.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/98951660802.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/dc29eekt9qdb0r5mg6qd2t9cr3/bewapujinujakabipu.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/73918282249.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d1672f11---lumegiluwupifa.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/24553436810.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d5f3f36910d---jovemesebibedu.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/nanajivunewemusenuzo.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/ffdt7lflsfqir697e7mbm7vtv7/46627401758.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/55015214021.pdfIn PDF document text
    • http://delfosventures.eu/userfiles/files/xezagabapakakomeb.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/lj3tdhc4mom2not5lrp7eivl1q/kidutawivulipe.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc8e210bf8---monigadaxunaxeso.pdfIn PDF document text
    • http://www.grdr.org/paidel/ckfinder/userfiles/files/jazijodenibepowewiteli.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/61250089384.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/41856928878.pdfIn PDF document text
    • http://manisafar.com/basefile/marcosafarir/files/58623269120.pdfIn PDF document text
    • https://beaszemin.com/files/dorubemidebazazarudep.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/h5deepqou5ti8oiher9lhe0n5h/gowuxoweroje.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070f0c8755fd---lobodetemikulusofurom.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/878b21dbb514d544f86b6e2d30436c96/23467308089.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/tunoganupesebazakemem.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_off00010c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A3 11088 bytes
SHA-256: 97a440aae94cdfcd0edf8a3d0cbc437bffc87b8c776b74ac76213b524e09ac17
font_02_sfnt_off00013e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E09 20492 bytes
SHA-256: 9e7c9f632112a453f07d2d891bf8350e578071f659e95cdc02e6caeab8bfaa59

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