Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1a8d798db53dce…

MALICIOUS

PDF

93.8 KB Created: 2021-08-08 05:54:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fb280a646165bbc035ed349e77c551e SHA-1: e190f4acbbc283123af4130dc3cbc3cabe872bd3 SHA-256: 2b1a8d798db53dcebeaa23696d170eed0b23038b055918ac31ea28b2584f1a0c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised websites, including WordPress upload storage. This suggests the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware.

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 http://inbeeldt.nl/userfiles/file/miwig.pdf In PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/11133948718.pdfIn PDF document text
    • https://daiichitravel.com/uploads/news_file/71956385110.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160870b8fb9d95---nebufumeribubir.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aabcd5b0f3f---bolejufenibajebiw.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/buzifonowanekonosisekus.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/dojiwegu.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3afee28104---49610941007.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b41cc0a61ec---84484576688.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/memuvikuxuvabesiro.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/a83ec3fe3b8c441d859c5554fd455ff1/31465794820.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/55791953389.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772dc64d2bd---7674383443.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/2343126946.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/56667577510.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/tamokerukosivufemux.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/pofupebu.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/ca591b003a6f0736b1d309fb0fd9e0d2/woduwu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a354b7824---95773032636.pdfIn PDF document text
    • http://missinternationalbeauty.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/suniserovijiwebarevaselu.pdfIn PDF document text
    • https://grandegroup.net/files/nixuloda.pdfIn PDF document text
    • https://carlojans.com/cms/file/wipew.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/63511365032.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/ff051294e4d0faf7f6a129fb232a9c1f/pitegedetositoposipeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+does+the+environment+affect+human+activitiesPDF 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_off00010ad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD0 17316 bytes
SHA-256: 2ba4609e049e78b283f7d563dd222259d88aceaf11f6d69f8986bc84986eec36
font_01_sfnt_off000137c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014fdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FDB 10936 bytes
SHA-256: ed88e93c12f388508e37848f7d77da9b5ef170e4739789f5fe135b873950bc57

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