Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b3f449df661403…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 02:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 798483fbca83d1167f4b6b049d68559c SHA-1: c29d5c0543cfaac8903db56ce717503f8e042060 SHA-256: 24b3f449df661403434f7efa877531186581020a6275c9b3333bbe7564efd343
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users. No scripts were extracted, but the nature of the URLs and the PDF structure points towards a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=guided+access+for+android PDF link annotation
    • http://sanga.asia/userData/board/file/33868602313.pdfIn PDF document text
    • http://4darchitecture.org/img/all/gajidonolutapujokewugob.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/xivetodo.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/63749471553.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/72573996702.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/95082990371.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/2758e669274c03c0ba326f929e60b7a0/funojevazerutepawokojemo.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/7093512125.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462fd143822---getokuz.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/92593535970.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210911_150410.pdfIn PDF document text
    • https://gulamanis.com/contents/files/57096530358.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/69021306086.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/32031039620.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/zejuwojakosetu.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/xitizoj.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/dapene.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ebv5dtolf9qscirk2hlff92qbo/45361788109.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137914284acf---26300157880.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/kemabedo.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/dosexamodezejevinijisi.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/tidelavapamowover.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://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_off0000e2c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C7 18184 bytes
SHA-256: 79c93451d6034009a9ff30939441b408883413187a310e9a6aa8ff2194bc7f6a
font_01_sfnt_off0001117e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12995 10464 bytes
SHA-256: bb6e238af492018b099d2adbcaba0b99c51dc1589f72823f3e3ea83a4d2942c2

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