Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7d8e079ca1d64b1…

MALICIOUS

PDF

70.7 KB Created: 2021-06-21 08:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b31217ebfa74564d87d4ac1d2055e320 SHA-1: 23bb66be850efa4457ff935b2fb4df6e4f94255f SHA-256: f7d8e079ca1d64b110164e5a7c0a176b0f40feae6ad33f397cc44b0d145f4b89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4141a3f59---goporomunemi.pdf In PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/076b4cb4dfba48c05601813f59e2eec4/fadamejatabokidimuma.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1cd75c76---47116309908.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/dadogepodel.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/miwebiwumujidonek.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9f3a85f1f---90279619625.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/dccaef63bbd9d02ec3bbe40d65cbdc7d/52236556626.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e63741f5e---resegusen.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/9765a1bc0cbac84e77687ec6505076d3/10326267334.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9089653c14---goximojitewozu.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c82934363699729982e919e0f741c71f/45340793610.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/fudazalobawuwinow.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815a34934a6---sisekitizibi.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/rfvgof5a4v1vrd28655ffcdjsf/35755781603.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/89010025376.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/sulesapujesaxubomapikip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=1000+micrograms+equals+how+many+gramsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb3da81bf---nuzevopariwinimafi.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 5632 bytes
SHA-256: 8c3eb7e332fe2ffebb842c9e6a013ebd703f79c58606dffa07107a6183cff10c
font_01_sfnt_off0000e544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE544 11340 bytes
SHA-256: f3571c3897393332c1e73dc11e88f2626325e8f9d47a0fe3edf4b4d50e93db21