Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1604ccdbb5ea13f…

MALICIOUS

PDF

84.1 KB Created: 2021-10-13 17:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b14da2ea5176fd9d49d881061e97c25 SHA-1: 6ed7161629e2dfe849f0e255bf86334733fb8a0f SHA-256: d1604ccdbb5ea13f19c7fb46774eb863634e2b6a78725df131352d3c082d5c7a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16155ef272f2e0---doridifu.pdf In PDF document text
    • http://droneducational.com/admin/userfiles/file/42988905912.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/17211520251.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/96005175328.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/20084331078.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/sonupisexanigo.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/gokagakaj.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/nutogapofi.pdfIn PDF document text
    • https://aedwea.com/upload/foto/dowosagetugubuvigit.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/69474150004.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/daloxe.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/46571878986.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/95227597545.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/692053dad644d4f3a67244779a98e7c0/16372041236.pdfIn PDF document text
    • https://flomogroup.com/upload/files/biboleke.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/81962592123.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1616258d8a0082---9073345139.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/56857336769.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/60335378397.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/xutewuxi.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/74286365632.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/31738199270.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/cmwvf4RlXg4/uplcv?utm_term=mental+ability+questions+with+answers+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_off0000e220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE220 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 11172 bytes
SHA-256: a3f57112fafcf2ef27aafc3755db5abe6447d40e9ff6f729a16ba35b7f9121d2
font_02_sfnt_off000113ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EF 18152 bytes
SHA-256: 7d5cd106cd1b0241ac681321aadc56d7fcf8d9539b0866bbfd66246e19190d48

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