Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b2363255d882eb…

MALICIOUS

PDF

95.4 KB Created: 2021-09-04 07:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40416674d78e07760e92f3c4b34d9465 SHA-1: b83be736f2fcd7a4e17232a729377b8641a13b83 SHA-256: b9b2363255d882eb5c9fbe246c1b14cf8ed87ae05ee31eb81da08758e15efe2d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content or exploits. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. This suggests an attempt to distribute malicious payloads or engage in SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://internationalmedia.com/userfiles/file/sarawaxakoboruzewija.pdf In PDF document text
    • http://classicalgardenfountains.com/uplds/file/13140327302.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/be486377f093175ebdff2169ac99b4eb/44887705861.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/51447469241.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d87ae6dd3f3---20373507279.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/d630a1dc7415601814226b87a0c09eff/bunerojepebovanoxezizu.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/verapenowi.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/3603026147.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/87757816044.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/xozaluzebaf.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/87235773302.pdfIn PDF document text
    • https://denimder.org/resimler/files/zowolunaweweti.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/wexafifemexawu.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/lafuvojujo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59b2800e62---65652254723.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160826d6d2d3de---73378646196.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeaaa3ceb0---85367221898.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/rogoxutajibovividotexe.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/20703170399.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/168f8b4aacef7c18f1c9a617385c53f7/75563471090.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/irnu68sj8ejt8fadni8ov1cjvv/12652450372.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60927779132.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/xapufatitiwose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jules+verne+journey+to+the+centre+of+the+earth+pdfPDF 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_off00010b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 19364 bytes
SHA-256: ad01b3321c50745ee6311277caf80cc4f7c7f0c3aec75af4b3800d6ac7cc3f97
font_02_sfnt_off0001566a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1566A 11028 bytes
SHA-256: 1f4c393587ece32959b46204fb62e0394811f9ebdd533b09fcc011aefd93c04b

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