Malicious PDF — malware analysis report

Static analysis result for SHA-256 70830ff311f69306…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 22:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a9912f65a047cbc41beeab937f43417c SHA-1: 8d171bd6f151f43fc13b022ae867cceb37159fe5 SHA-256: 70830ff311f69306406b77748235037228956b7be0aec9bf764193f78daf376d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's designed to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://prttour.ca/FileData/ckfinder/files/20210724_900B2D248AE99EA8.pdf In PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/mixevikomigamerova.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa78907381c---8168898799.pdfIn PDF document text
    • http://teplospectr.ru/images/files/kugogodogovurevavomute.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/1052404162.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/vagapofojaxaton.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/25838964428.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/kebazarolawali.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/56987122788.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/widefimosejidetejix.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612181af6dc1d---99558674424.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/23801991317.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/28758988264.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/8772535539.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/22685338566.pdfIn PDF document text
    • https://netpage.info/userfiles/file/2876494743.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9cd5b3f3---pifuxevexubavisoxukidik.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/fijiwijurovufuvetigebap.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/50495007902.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/99167014169.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e145d48dd3e---zekalepilusolipu.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210604_B540DFD761C85F62.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/10471849131.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/16592728388.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ht9ugedqm5kkv7dhl9t2mea35u/42700296306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pa+driver%27s+permit+book+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_off0000e193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 10844 bytes
SHA-256: b0c8493193fb2732bda712c98f1d2bb7e1d71a408d2d9f6a8ce934ecbb75984c
font_01_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 18084 bytes
SHA-256: a72d5b825aec25be3201f5197ea06709bc8f89a381f6aa79b928a62c32874f25
font_02_sfnt_off0001292d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1292D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1