Malicious PDF — malware analysis report

Static analysis result for SHA-256 280b9477fba213c1…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 07:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b4310d43d1d62c37a5d23fdb6ea5a34e SHA-1: fa01336d211b58456c622abff2b5b2e61bc97c32 SHA-256: 280b9477fba213c1999e79cd014eb6f18be032ef967bcf986e1b63d7753428e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a988262e24c8d0e9f0d6048c0a2902ce/23983822208.pdf In PDF document text
    • http://velocimapper.com/webfiles/file/togidexeverigom.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/jefifamijezakefugajetek.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/uib790utq07lnrbl4q8o4i79qf/68831487124.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/penasesanozeseb.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/53349211024.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16134a7b763eb4---82359884832.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/fugejowawekopulukikusawu.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/istkanvs38gkoarr4dpk4tf59f/kusipapigaxavenesa.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/ganadefofoxusaxo.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/ruxelutesubutota.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/59364166273.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/rerejuxebulofa.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc1f191809---nokutagemafarulaval.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4b30270a7e757ded9b71cf5f6c2ba51a/35749994803.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/90920967345.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/kolamalekubazudifavum.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/75824126284.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/nefofiniminagofage.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109040513498987.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210911_B3310FF3B970A270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=update+play+store+download+apkPDF 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_off0000da21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA21 10592 bytes
SHA-256: d0356dab2ebac1cec77c7b2dfee093280cf76f72d2a9dded1dee19a4ac44d3ac
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA3 16780 bytes
SHA-256: 3ee9ad91b9538897456d907de0bc004167a603e3050162c2805a60473e962018

Open this report in the interactive analyzer, or submit your own file for analysis.