Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf11deec791d9fe…

MALICIOUS

PDF

92.4 KB Created: 2021-08-21 16:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7166360591883b6a68ee684a0beb4c69 SHA-1: 5e2f43c4384e5376c3708c434a40334eb262ba9d SHA-256: 2cf11deec791d9fe5ec3e3937fb5e3821629aa067acfc9df3d7222386a84d8f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://bioscipublisher.com/files/upfiles/file/xefuxaxunoratotewexex.pdf In PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/20296926552.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c01b3e5f1---gupemotikuvox.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/56098852844.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/ximudufagifivukuji.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210714090332_l13eng.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/86231162620.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/13570861940.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/9bd31c0e4e01ab60b85afb02993847e3/11327867474.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/32d6cb942fbc46e32877180929aebba7/xufiwafowiluw.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/9082300689.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160836554f0376---kogipumedogunidu.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/zavires.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1930b7803b---zaxolekisewobexazaden.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/97776743990.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/jubetotimipuduzumufifi.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/54915b5535484402ee616d59d7bc6c23/jefulusuten.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/fegekapomib.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff723533bb---5221232091.pdfIn PDF document text
    • http://coumert.com/images/file/81802743518.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/80vhp0o17f6vbr2h84nk1vkca2/28544931606.pdfIn PDF document text
    • http://bonapartefamilynetwork.com/clients/7/7d/7d081654635712149502d88e72c54c2d/File/8883377235.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/b28e3853649e6e3686338d17359fa6ed/remegaxigosu.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/lewemerarumukoburozozibu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=compare+and+contrast+the+characteristics+of+neoclassical+art+and+romantic+artPDF 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_off0001031f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031F 17224 bytes
SHA-256: 9930b82d8cc415f7ce94ff7974a8b19a77e32d53201aa17532721ee3b5274b6b
font_01_sfnt_off00012eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAC 10916 bytes
SHA-256: fd20ef491a5f36eeead8d6a0444dcc5e70235809a4067435f8686c40bab5d87e
font_02_sfnt_off000147b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1