Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f12368bc81193e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-24 11:02:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b78a619073f40939d50e2b6a8db2969e SHA-1: b474296386c7c4adf4dd98c0da51fc0c641a8510 SHA-256: 46f12368bc81193e299410b919c6cc9aaf682fe4efeebd2f30bedddc5c3fa2c6
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a link to a PDF hosted on a compromised WordPress upload storage further supports this. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=how+to+clear+data+in+chrome+android PDF link annotation
    • https://alsultantrading.ae/userfiles/files/16863821312.pdfIn PDF document text
    • https://dfkcnc.shopper-store.net/file/files/vesodibikarepomivofovap.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/mebojutezigikogurusuzivug.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/02aaf9f521b02832273925cdbc12cd18/78696778669.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/najiluluzaxe.pdfIn PDF document text
    • https://vzglavniki.net/data/file/8064189785.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/dimepotetefegatijafu.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/99111767942.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/23e7fd3bbbe85d505a73f51991712483/95992557860.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/kemamitigote.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210903102439.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/86518148509.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/99616939206.pdfIn PDF document text
    • http://learningkey.org/userfiles/74148450071.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7c61c0857---xuzelopuxeni.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/35626881347.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/42863153577.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/tovoson.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/giragajajanez.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/palexebamugezirepilaro.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/juxoj.pdfIn PDF document text
    • http://integrotech.eu/zdjecia/file/rupamuju.pdfIn PDF document text
    • http://e-photosynthesis.org/userfiles/file/1983294574.pdfIn PDF document text
    • http://change4best.ru/upload/file/nuwovokonubasolulele.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/57858430502.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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 10544 bytes
SHA-256: 3cb609d9341eef48d904834e2637ac2d2b6592b82aaff5edca437ca7f35856e7
font_01_sfnt_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 16864 bytes
SHA-256: bbd4d72634fd425c84ece84c286d35956aca411a1c22a3a45452c0ecbd29e29e
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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