Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d14918dd16372c7…

MALICIOUS

PDF

96.4 KB Created: 2021-09-06 10:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1fb5e0d1d7d1d6cfed7328fbfed0ac9 SHA-1: 99ac3969e9c592eda637366bb4a94f5db17db366 SHA-256: 5d14918dd16372c7c12e5a37d5a7eec93c0be243ddf9729cca1a222e5d8e0bc9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects to external URLs, as suggested by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, which are often used for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://sutinlawkrabi.com/ckfinder/userfiles/files/mekakutasavefikexodedejil.pdf In PDF document text
    • http://studiotecnicodama.it/userfiles/files/bitetu.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/dekalosufelexefizokunili.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/66572594395.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/34991953609.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/23139303261.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/kolaxovuwon.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/zamemiti.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/8c81128958848f06436b9b805648628c/xolatimipuwajatimobun.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3185c9e8a---tomerofusilarepoxudefe.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b28e1d0d616---bogazibepelazegegebawoloj.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/gimubemogo.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///74548340919.pdfIn PDF document text
    • http://signauction.net/userfiles/file/majibatem.pdfIn PDF document text
    • http://poliinc.com/upload/files/boborolevoruwumogudiwij.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/3279731058.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/manefetoxil.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/damaduvetebumazowebaxas.pdfIn PDF document text
    • https://33mobility.net/uploads/files/37563364891.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/16015950762.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/0a58cfc02a7e57d3e3b0216410bf0d2c/43481542080.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/59849122133.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/kefavoxibudiwuviriki.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/9acm26q3519l8tocomldaidl08/58086164627.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/kugewaz.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/96310910713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=hiv+o+que+%C3%A9+pdfPDF 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_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 10268 bytes
SHA-256: 24868e11f5ee3e7bd8b700ae0028d8282f99709015d26f81f402a3a20292e878
font_01_sfnt_off00012543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D55 21232 bytes
SHA-256: 6c7a7bccf7983e35767dd9c20ab435f9c3a365cc60378f1a827dcb32fbac99d0