Malicious PDF — malware analysis report

Static analysis result for SHA-256 865d4c63bd34d65b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-16 11:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fa40994ccffdd9656a28214da87c7752 SHA-1: bbc635b2db40a9ffe1fafdc1d3c5aca55efa1a48 SHA-256: 865d4c63bd34d65b5e42029a4d88a518d1c9306a5e33a89d65f606692bd4e9f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ebff0c1f9557dfd6683d68acc16b51c5/zuzonanudejafo.pdf In PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397f205dc3f---nejoju.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/47949256110.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/tixen.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/bomovexaku.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/76810981268.pdfIn PDF document text
    • http://gr-chem.com/upload/files/janezotugifakodiwadaj.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/69503783982.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/zulefumigonu.pdfIn PDF document text
    • https://ka-base.no/images_students/files/sejazowobezewawilazilas.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/92sd8dkbm2er5h1jbv8uh59q1g/simajobikipe.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/82619839060.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137b13a26b09---jawavagamixipi.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/71339169213.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/12767681107.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/xujukurokisuv.pdfIn PDF document text
    • http://wsm.hk/images/files/zevunapugagisufiseduw.pdfIn PDF document text
    • http://schubert-hh.de/image/file/30845124566.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/soxubeziworove.pdfIn PDF document text
    • https://umutfm.com/resimler/files/97132743877.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/milufujomupi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be19119183---62838934009.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/66096231962.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xakazepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=mobdro+smart+phonePDF 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_off0000c514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC514 17472 bytes
SHA-256: 54c9921fa1d34b4281daabdbd607fc8aea073c2eb4edcce8c28655866455d592
font_01_sfnt_off0000f1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F8 10652 bytes
SHA-256: b825fcbdbd269983704d6fd06a04cd0d272f0abad70020e3371505d739fc7889
font_02_sfnt_off000109f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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