Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe3ec6d4e3020da…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 15:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ff7dcb8d26c6ad539c6f4c4f3a2646d3 SHA-1: 9fe71c2ec33bca2ebfe2f599f0e6e7e01fc91329 SHA-256: efe3ec6d4e3020da9126cee396a788d6a033e01ad8b84eb5e36603442d76c2aa
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to various domains, some of which appear to be compromised WordPress installations. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the structure and URL findings suggest a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135684c6e3be---kelatobomirajabipavusaga.pdf In PDF document text
    • https://firesystem.ro/imagini_ws/fogixizigumejubakika.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/87542745020.pdfIn PDF document text
    • https://znalac.com/userfiles/file/rofuvuvajeketojewebupi.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/73376179176.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/lixoxibutezomiwemitapi.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/xixakinutekigiradukugi.pdfIn PDF document text
    • http://fpole.ru/sadm_files/tagaraximejewipamidazuji.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161320e9cc466c---46492891101.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/zusamoxeluxamafova.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e37b26d6d---98855057412.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/23072918697.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/83255924194.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/betusirufezubunev.pdfIn PDF document text
    • https://luminex.pl/upload/file/43719626237.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/viwegimowafixitekapegege.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7463aeb75b857b9f41db555abf2f2d19/xijazeroka.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/kobaxasakagofavenuwazeru.pdfIn PDF document text
    • http://abnicum.ru/files/file/35537957982.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/zojavezoluxixamex.pdfIn PDF document text
    • http://poiskvod.ru/images/file/jivop.pdfIn PDF document text
    • http://kirsanov-maslo.ru/uploads/30387041.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/modilugiputisil.pdfIn PDF document text
    • http://fairfresh.net/assets/admin/ckeditorimage/files/daxedu.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/puziwinumelidi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+offline+pool+game+androidPDF 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_off0000e689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9B 16764 bytes
SHA-256: 4f9f0cff9354a07e8cac1e7f9ef0ca8181b45808a82189e4144a063a6b2e1e93
font_02_sfnt_off000129fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129FA 10892 bytes
SHA-256: e3e8f57e9e6d05e4c8bf947a3075a0d950032694988367cc79f3e918c5bd1e6d

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