Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf36ddfa4f14d07d…

MALICIOUS

PDF

76.0 KB Created: 2021-09-08 12:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5aedd3b40b0d179c985a2bf5c81a8390 SHA-1: 73c9b172cc4e538bbdbb2221645bd8a0b335d482 SHA-256: bf36ddfa4f14d07df8718360fa523012db26ce9a5f9329ca9936ddff388492b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) is a key indicator of the attack's execution method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=customer+satisfaction+towards+reliance+jio+project+pdf+download PDF link annotation
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137fcd553f18---nunujatox.pdfIn PDF document text
    • http://fpole.ru/sadm_files/pilupuberadamujamopesi.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/galixesifivalajibumazor.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/favigerijizuzefive.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/vapimidebukiluwinuxexo.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630732808.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/72144662390.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/98850756822.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/56ba18185b98a32c3a8e0f7538178ad8/zizotozeduv.pdfIn PDF document text
    • http://fourfoods.com/images/files/wijukexekos.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/fivinazejedogafivovabuz.pdfIn PDF document text
    • http://carrozzeriardue.it/userfiles/files/2605396338.pdfIn PDF document text
    • https://777mto.info/contents/files/dotuzuz.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/he83qc9h3gj7s2o77qnpnkcs41/mezenexu.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/32b82f45344c9b54c43f5c0752381015/67437130813.pdfIn PDF document text
    • http://contua.org/userfiles/file/pujazubugugudapiziwada.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/donezudunozabufimagodobi.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/nebowosifu.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/31501733366.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/nebulajojumorexa.pdfIn PDF document text
    • https://steammining.com/userfiles/file/merozejoduvegaxujeninarer.pdfIn PDF document text
    • http://www.larucheapain.fr/ljk/file/47224027146.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/202193353466678.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA27 11128 bytes
SHA-256: 3963bcfd56fb65aebaf6e861c5add4538aad5c6c01a8e86a4aaceb0f3bdcd6a3
font_01_sfnt_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off0000f4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EB 17232 bytes
SHA-256: 4b993d49140da9017a045b403db5435077d15b8cadc2c235d90e6717929fea78

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