Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ef8f496fc668b5…

MALICIOUS

PDF

82.8 KB Created: 2021-08-30 09:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 028ed270b935d14e45cf57606368db8b SHA-1: 78626784b8f3291bca363ae0f8e75d42e3281896 SHA-256: d6ef8f496fc668b5ca3090f5d9e42e3a6ff25346a85636c55e53fb962867311f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating a strong likelihood of directing users to malicious websites for phishing or malware distribution. The ML classifier and ClamAV detection further support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to exploit users by redirecting them to compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://drafthe.ru/uplcv?utm_term=beaches+in+istanbul PDF link annotation
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/mvl1it66svsom9ahgtme01cr1b/tumem.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a932f72fa2---58701914398.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/wavisonum.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/jb8opdpt12n4mu6udu8hfr19n5/81013258517.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/30078136446.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/15881742570.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/72244120830.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083428952218---xevidiniw.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/47885574043.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/n5cmleuc9spcj2fq7f8urc8elf/20509606171.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609415503617e---setajonewafi.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210520170721_423647600.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/8869725192.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/po7ebovvtgahj876lj8dbt5db3/5665145230.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/17814227675.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160917da7c2678---renomamarawagusiguwelagi.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/79066687219.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/votatus.pdfIn PDF document text
    • https://oksushidelivery.cl/sitio/public/files/file/livasitotonakuxida.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3d69705c---pijefegobobasowiv.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/c0ab3fff5b9dd565b5ef0eb3b9bbe556/supilivezapik.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/498e0vchfits1h9ad0ni8pl9i7/91159328368.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kiwaneputuxigomexinite.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_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA11 10400 bytes
SHA-256: ce8e94df4f7a7475ca5310a30b8dfec3ac8932f7af356e4f4b86b3232e22c551
font_02_sfnt_off0001118b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118B 17252 bytes
SHA-256: df5db9cdfd11df8bceb71db2467c545d83736a551007a0da444a9322614bd737

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