Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a36a588cc6b79e2…

MALICIOUS

PDF

77.7 KB Created: 2021-08-09 07:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d472fcf583f5503f9b0ccea15da6ff39 SHA-1: 2c82064da62a9f23ac41bac26fa1a100f5daf33d SHA-256: 2a36a588cc6b79e2f330890e8ea944237445a56213fe7d2c51f781853b833b81
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://drafthe.ru/uplcv?utm_term=nj+transit+2+zone+bus+pass+price PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c969c4beb20---53377002511.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94eea34f9---3893174709.pdfIn PDF document text
    • https://etimes.mn/uploads/files/zegisividomoserupuwo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608babc79eb56---36415905592.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/38e9ce064f8765032e9044c0fe578973/32865466659.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5c68c551ce44e79582eceff512a3c6f/gazelutiku.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/tagogodogudotateruso.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/pusuvuwedowefitogiwedex.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b665869026---ginapowuloxizate.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/33567563963.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/wufimogi.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a305226a1---92262878645.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc3fe73d700---600330091.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/gekozopif.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/66454302689.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ffc1abba4---lemaketexuzizomolurugixa.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/tuxezekasaxorabutipap.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091290c5fea9---42557267506.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xonefapekezerofi.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/fa93a9327f7534f795a6f31649335b3b/68246069647.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/96100428136.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/60084816649.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/lomojixuwodaleniseruzon.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1b4c27d7---49773761602.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_off0000cc04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 10848 bytes
SHA-256: 013aa56cbc2595277a8a377e3600044c938a8ef8ac0c7e134f36bbe52c27d735
font_02_sfnt_off0000fd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD20 16516 bytes
SHA-256: 1790cb7e8df60c72a8130d4774b7567e1d6ba84758918a98048e2b28a1bf189d

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