Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff60da2fee39620f…

MALICIOUS

PDF

82.7 KB Created: 2021-09-08 19:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3641b116f90a8cd94200f168ceb7ef3a SHA-1: 686a4c3939a8c4b2d61d0c68f34fc7662986b1c4 SHA-256: ff60da2fee39620f275fa90e78f1beaaaaefec9a4de92b09aeec5947636064b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious 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 https://krisoc.ru/uplcv?utm_term=the+prophetic+voice+of+god+lana+vawser+pdf PDF link annotation
    • http://baikalspring.ru/ckfinder/userfiles/files/30052413693.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///viwikevaji.pdfIn PDF document text
    • http://bulmarconsult.com/files/jusosorejagatavar.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/83468871892.pdfIn PDF document text
    • http://zzquansu.cn/d/files/22435326684.pdfIn PDF document text
    • https://visualmotion.nl/uploads/file/kulimodawigupape.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/15963768930.pdfIn PDF document text
    • http://laboratorioshamalab.com/userfiles/file/xominosobagedesakapamo.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/kelivu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/60907ce30479415df8be612efcb22b92/72771263548.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/pukasajimo.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/65736838445.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/17494909192.pdfIn PDF document text
    • https://pensiuneaselina.ro/userfiles/file/46752063937.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161323b18e217d---fofisebonaje.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/wuzununubizap.pdfIn PDF document text
    • https://kawanmto.org/contents/files/67207731759.pdfIn PDF document text
    • http://mcutech.net/files/32504932910.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff92d6c77f---32608418966.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g2e9aqd0h7or26tha3m3tqg595/34948206197.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/fiwopu.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/63291571392.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/64455900670.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/mokovizago.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/96470163610.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DB 11016 bytes
SHA-256: e8c380383d0929d18f2c8662e77e6899b64045d50c3f59c515f0ae0ed1dc7549
font_02_sfnt_off00010d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D48 18068 bytes
SHA-256: 8cb1a7cc3b6bc8d68a86d09b35309520c5d3ef1074e53893f58885e01e5e2ae1

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