Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a4e5e82f3d0c18…

MALICIOUS

PDF

87.0 KB Created: 2021-07-17 00:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 65c5b9f5775a702b5ad816a4f7254314 SHA-1: 004aadea0d3ccd0e9e99e63b79ef59972b19d2f1 SHA-256: 83a4e5e82f3d0c1874c97fa36db623688eda333650edd5ed78ea58767d0a1ef4
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely for SEO poisoning or to serve further malicious content. The presence of multiple links on potentially compromised infrastructure suggests a coordinated effort to distribute malicious or unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/1c560fa04bd29637ec0b09169c05cccc/89102370260.pdf In PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/16930420099.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/vfmi33c5fstagpm6dcua0snmd1/27873464885.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/1nq38r0fb2lc364d921i6crq74/32670864856.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/c295d9409b7a8fe6d9daea52f3429ac2/59358336263.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/gopez.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f8a011741---vebifiwotafudenifulukeseb.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/69847904036.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/upoel1qe9b0qqltgurlvh38j5j/nolaguniritolunaw.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kewobejexel.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/e53fa639e57cafe3541e5216e327e267/33324644515.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/waziriva.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/33315350919.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/lekaji.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/41980481733.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/95757079493.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/95181936979.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fe5316f75---25364161388.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/6444956676.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/23593932828.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41004f255---fokuzowu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05c858f54e---25344008935.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7645865c4---35509427944.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=streaming+drakor+i+have+a+loverPDF 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_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 10760 bytes
SHA-256: 9bb2778cd53d2baca93bfcc5db12640c88cc47ef950cc211fbadf31712bedb65
font_01_sfnt_off000108b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CA 17396 bytes
SHA-256: de5ae365a5a1383e4d69ffab48e464e0bbabfef86d7c7f088bac6d2fcb11274c

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