Malicious PDF — malware analysis report

Static analysis result for SHA-256 048b508c84205ecb…

MALICIOUS

PDF

81.8 KB Created: 2021-06-29 23:09:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a2e05077fd09f06b36f9be6da56042d SHA-1: 2ef444e73d9d5cbf15e7256256992e32361293f6 SHA-256: 048b508c84205ecb4c1e8be7d7a58857023b814b91fa96f6849bcd61f000c6b4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS upload directories and disposable domains. This suggests the document is designed to act as a link farm, potentially for SEO manipulation or to host phishing lures. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://goodtraefarm.com/ckupload/files/leguluwevuwujatamod.pdf In PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/770e9003a9b4090066280ad2fa59682e/57861289291.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/50159117130.pdfIn PDF document text
    • https://immobilgold.com/file/41391142843.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210608_235646E194D452A6.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lilolubumunujitamavusixas.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/nukaqug78it8cupd2b2nlh1k4m/fifujamin.pdfIn PDF document text
    • http://aawyx.com/sites/default/imageuser/file/90109544738.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/ab18b1dc6f727d0d1e7333d6fff18fde/15417306037.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ecda281ac---67593803410.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/dorunolu.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/9812120408.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/girusavenupetisa.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160790cd9c3975---webutipidid.pdfIn PDF document text
    • https://smallislandcurry.com/wp-content/plugins/super-forms/uploads/php/files/7c97895ec76a9d166b7dbcce511bef7a/fuwasotesonizuripegaferux.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/135375c6a5dae4e0c83692e91bb1bb86/zefejivomukoxa.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/wobenajaxera.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/tosobikolojuvewik.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082cbdb08a50---24578443321.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cgs1q0ghf6taeerc840hrbivu3/30131127130.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/8vo5qddihsnj7ac9jiaubkk9qr/22440482066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cut+in+line+meaningPDF 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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 17856 bytes
SHA-256: 80343032653e3e209b32f76d7353ae051158896de007d7a0336cc3ddd76d2da4
font_01_sfnt_off00010a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12221 10196 bytes
SHA-256: 546fc11ad2a839d2de10834dbf4ce965042bbe430b5f84340dff37b09d1877ed

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