Malicious PDF — malware analysis report

Static analysis result for SHA-256 14219a326c696b11…

MALICIOUS

PDF

76.6 KB Created: 2021-09-05 07:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b6d6c0e2ee7934f0f2b3dbde70f1c4e8 SHA-1: 3c17c2884781a5fcf42080357004b1c63dbc7761 SHA-256: 14219a326c696b11a84d6ee5ca1267a73a7c103a34c0684113c1230e1a24928f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics reveal that the PDF contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's used to distribute further malicious content. The presence of numerous unknown URLs associated with these compromised sites reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0def182f---sebezisudut.pdf In PDF document text
    • http://webatnet.de/ckfinder/userfiles/files/60519093577.pdfIn PDF document text
    • https://medius.sk/userfiles/file/40128251376.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/gisajaduwezizi.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f8992d77b---bebigadakuloviviwetisuli.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/jiwol.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d51496be82---86014824524.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/lonuvakedujake.pdfIn PDF document text
    • https://lasanisports.com/files/guxotot.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/12015900456.pdfIn PDF document text
    • https://andrejc.si/files/file/75181826726.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/xejudaxofitilexisijezizak.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/zoxubixoxoresinigatiwo.pdfIn PDF document text
    • https://stvorki.ru/files/file/fegaxukiv.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/85812413545.pdfIn PDF document text
    • http://ymmicro.com/files/files/13828000654.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/24395212024.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a27af3c1712---807167027.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f593c1bb8d---95743156723.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5eea8e05f---80338208029.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/13847499190.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2aaade51a---50779444197.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/47249189145.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16076c57e44c3c---wewerinalojiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=imunologia+b%C3%A1sica+%2B+abbas+4+ed+%2B+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_off0000c482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 11216 bytes
SHA-256: efbddbe2f2736e99c2611df4e7f48c42ead34a6716a32e2258665e77e2152ace
font_02_sfnt_off0000f610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF610 16980 bytes
SHA-256: 521dee75d66342eac2ed98f40e699b41ae0b533a6a896532528472813bce2ec3

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