Malicious PDF — malware analysis report

Static analysis result for SHA-256 170965a8dab2f16d…

MALICIOUS

PDF

97.0 KB Created: 2021-08-16 02:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5a19994a24dff92bb10ab43b1feb2ad0 SHA-1: da915e0262d32128458c99151fd8eff605816bfa SHA-256: 170965a8dab2f16dcb1f9ecf60e2ddd414c596a682b17aa926f451f148ce3e98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=delonghi+magnifica+s+descale+procedure PDF link annotation
    • http://marcus-1.com/FileData/ckfinder/files/20210603_27EA1C906DD1D0E6.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a0aa32892---xaxixadifu.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/kopowesefalonibik.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/42919775817.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/32951225450.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/98863101811.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ebe1aacb4534657f5373551c689c06f8/zunomikivirufapawasubapo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/41354843624.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/81402707073.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf4d05f916---taxopezaf.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/99772008886.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/3iu95se1goec4mhlcr2ucbdc5b/76451420947.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/kazupedasupoxutagenapek.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a901be09---34472265130.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/6256199431.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071e481e79ff---patunajabu.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/guxemanuvuguxowilejezilu.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/33439762554.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac04e8000ee---filowunuferusimetuwetigaf.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851f5e6b95f---dumesarujikorabuluz.pdfIn PDF document text
    • https://andrejc.si/files/file/derajevasilaf.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/nisosatogudizitas.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_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 16764 bytes
SHA-256: 07bc6919154a340496290f253bed59e77a97cce504a18e580694c0cfcdc60e68
font_01_sfnt_off00014399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14399 11068 bytes
SHA-256: caf7a77d6eb94ced66cb05ba8e3fcf63b23d4c06b27b7384cc8f624d8e544e95
font_02_sfnt_off00015ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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