Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11b96db503a932c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 13:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7b1ea3a83cf93b6d8c37a63962d0dfc4 SHA-1: 66cb5770fbd2942f529626b496547ad8e49d32cd SHA-256: c11b96db503a932c30d14cc9d01afbc8a2f9da01cc241f1a9de479f2663ae296
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://liceoadultos.juniorcollege.cl/userfiles/files/77210874634.pdf In PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5buscpe4pfpknqjf4dkbb1urpt/xojodupevajufitorobop.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140d4c77980c---32603702494.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6e82a8fbaabdbe96b2cad6fb71036863/wowavu.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/43804006903.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/d220148cd9fe1f1f8b5a12fb5a30766a/10209925702.pdfIn PDF document text
    • http://www.depomatrial.com/file/bakin.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/subupotamizelukonun.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/60328998526.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210924144300.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/67474540956.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/77660139287.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66048604830.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/dupupigojanobuzimuwa.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/puxutagowi.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a0375adb7e0642bc2864e2de49483db7/nofufuruboselewa.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/nalujasekepu.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/51168728597.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/30tu1rojtonfci6f94nnl95fcs/riwizolozim.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/kajafigo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a143daa0c7---jifazovujemigugujazawudaf.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/21924509393.pdfIn PDF document text
    • http://co-mit.com/uploads/files/97333436774.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/gonatevifovunapalowawu.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/kidor.pdfIn PDF document text
    • https://yifff.se/userfiles/file/307736345.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210907211150.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=android+color+palette+examplesPDF 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_off0000b6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A5 14508 bytes
SHA-256: 4e530780304d7186ef795f7c5d1f749e92a654b1e1078134a35f680660634423
font_01_sfnt_off0000db08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 10756 bytes
SHA-256: 4820dd19d860ab7e61655d7387c072cc9233908140c8eca8792f93f21d340699

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