Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d09547a8e19fa9…

MALICIOUS

PDF

90.1 KB Created: 2021-09-02 05:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d39a7068d83bd1faa65dc59febb0ebc SHA-1: 9942f56f43f811ed3e2b6c2e5329f59edde61d2f SHA-256: 88d09547a8e19fa9ca1fd47f97194d1ba8d13dbe96fe9b47fd3aa2c27ff8347a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm hosted on disposable domains. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing trojan. The primary attack pattern involves luring users to malicious websites through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://daotaolaixesontay.com/uploads/file/mibuxit.pdf In PDF document text
    • http://wingmanresearch.com/userfiles/files/puvovawimugokilibowonuzof.pdfIn PDF document text
    • http://benhvienlaptop.biz/userfiles/file/67302392383.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/56761667482.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9afe3b8ad0a3848bae6a73a73db735ab/99971908890.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/14175022002.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bfafe305ec6---juwenexuxowa.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210820052725.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d71b62fb48bbcfead5ff9c576962dd6c/92001934684.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/94810012023.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b5d37dd242---49369802999.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/hqrc4cfsk9ihf90qrqu31rit4t/sowasobukepuxixuzaxemalox.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/xikarawo.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/82072516958.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611133eb405cf---38710772741.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed28ac6e9d---7476820890.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/sevifobibawewijod.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/vitemi.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/26gr0suiac135v0fmdpqr4kji0/vilagijeli.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/zujakofuvarovan.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pakebenabepabafolorusaj.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/43340923417.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/62141614557.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/rm6knnfj9iauldq6pt57bh2hof/65565378753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=divine+revelation+is+about+god+making+knownPDF 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_off0000f9dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EE 18036 bytes
SHA-256: 58459da5ef45a02e145fcb5db825defe660106760eeff983f1c5ea720ee16d68
font_02_sfnt_off00013fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FDB 11076 bytes
SHA-256: 42a9a4fe06e3905b4368a1ca27e1e377e7f8498aca7e935644751dd1ef7fa30c

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