Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aedd68538ccd38e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-09 07:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7699a00a0acf6c14acd8ca5ada6e715 SHA-1: ca08642903d33d896150cc1af9ada54bca025041 SHA-256: 3aedd68538ccd38ef4a32f322facdcf9977b1d6b7381993737326f79e823ca34
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous 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 distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://eschool365.in/js/admin/uploadfiles/file/zotasi.pdf In PDF document text
    • https://mtydizayn.com/userfiles/file/fejilazuwemifan.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/somonimizogukene.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/70992006533.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/77043169797.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/15923378889.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/57207193084.pdfIn PDF document text
    • https://mimpidia.com/contents/files/tofuxebuj.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/bidigupog.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a0k09ujb7mh1p2a2kg68ga3643/korolowuzominuze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613536aa56767---tikazovigokoro.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/47620696343.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/givepa.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/117162178.pdfIn PDF document text
    • https://dcimx.com/files/larewuxakaridal.pdfIn PDF document text
    • http://taixingchem.com/uploadfile/file/20210903041228860.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/fetitegusej.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/tabotidovidi.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/55197650023.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/24695134388.pdfIn PDF document text
    • http://copingconversations.com/userfiles/file/gaguperugojafumuzepeneka.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/4054161492.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/bajusanosuzoxukesewu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/9d7e2f02e5ee13f6c4bc4e000d1e54ab/86505172023.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/voriwemepafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+turn+off+chat+heads+in+messengerPDF 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_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 17636 bytes
SHA-256: f68a5fe4ae1cd291fdcef808391b98f898a5604c2951a8039d6c952a295fe9a4
font_02_sfnt_off00011b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B52 11052 bytes
SHA-256: 675e6e3afb7d5925d97a9185842c96e162a3d7ba25c0764e75d0f4e2ab6d1072

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