Malicious PDF — malware analysis report

Static analysis result for SHA-256 4287a5c08b9c4730…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 01:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6951a40e660b958e1a3a7b6b34e28ea1 SHA-1: 7c7c4b295ab6c545b328d35f48bd2a10ed325606 SHA-256: 4287a5c08b9c47301bd9e1d192c950bd4bb9eb065c3c9e538e5a4f02d55c7f79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns suggest the document is designed to redirect users to malicious content.

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://arket.io/wp-content/plugins/super-forms/uploads/php/files/7l73a86kf1hbs7klu9jr6ln0h6/51033403961.pdf In PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/20153052316.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c18eeec4f75---89343487016.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/53450384878.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/20070134157.pdfIn PDF document text
    • http://doer-sh.com/Uploadfiles/files/64689730444.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/95b4a10dceab4e6ba86b7f1d509f7e45/fetigefetepegazod.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/30251929395.pdfIn PDF document text
    • http://greenbrier101.com/userimages/kexobafiwur.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/15993561461.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/zapewapibavadoje.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/fipawatuxulug.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610066bb7cfe6---38537327522.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/safalumujamipuburunoguvew.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/19288789759.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/70h115csh6i9ncfgvke8e3673e/jusedokulokopazigojaw.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607890d98971a---zevibugasotugapos.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/loreparubofetizumesep.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1d0eddfa0---76641113876.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/nifopedusadezuvu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021810555319422.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/4aa5bacb9e2a691c60a244adbe347688/16125603858.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/42634141a24cfb198bdf6f1f3577cb68/37736396521.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1817a9add---36688630704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=calamansi+extract+as+stain+remover+pdfPDF 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_off0000d92e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92E 10980 bytes
SHA-256: 85e271ad8131f08b530809273ddbe6352d66bf053173dced353899b710363585
font_01_sfnt_off0000f2b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC4 16660 bytes
SHA-256: 6189979cf62f753bca49c5916c6d6069d84a5cd83f16f21bc1e5a1a0f63d574a

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