Malicious PDF — malware analysis report

Static analysis result for SHA-256 f756d94e6734804b…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 10:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff413646bee900230c65fd3bd16805dd SHA-1: 7c8ab6cf20b5f6c78657de8e5b971c99eea35200 SHA-256: f756d94e6734804b6328f717e25057e1acf4ee6ef1fb6558844c74608b7c4583
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of multiple distinct hosts and disposable hosting indicates an attempt to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/29f2861811a31d08221bf5d6a609e41c/paxezasiz.pdf In PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/putisiba.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/vfl9ofro651ss5snq2qnjs8bh8/vigepadufipoporopaxu.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/kawaridenidijeraxinezifi.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/32275389128.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4be162cec---fenaridedudubuxuk.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/lugav.pdfIn PDF document text
    • http://apple888.vn/luutru/files/63267394170.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b218beb8ec---ligatelovamakadolurosulof.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/34055875354.pdfIn PDF document text
    • http://fitviewer.biz/files/file/129661039.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16099d4343aece---91970780895.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/45182573572.pdfIn PDF document text
    • http://mebco.ru/images/file/tomixejomosefurufumitiro.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/2136515490.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/69475767040.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/2370541495.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2eca57b90---sexisidi.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/pukafufesikujivutura.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/5c9098488d570e88500f255f0d9c8f86/sedesirixak.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/015314034f325e60237f1472bc03a5eb/taroxi.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/d2f058addd57f30ff457cdcb0ab726f4/pebasuvuzeguvunifijin.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f27ebeeab7---mujegixurijug.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/lifatize.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f410785416---mododaraf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=amoeba+sisters+pedigrees+answer+key+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_off0000e665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE665 18484 bytes
SHA-256: 57db447d50b4029091c418147b7fcbf1964b6657d0fd8657e5cb59026ed72692
font_01_sfnt_off00011678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11678 11208 bytes
SHA-256: 9b2655ed1b4dfc530f27d820bf5c7f3651221234e332114c8ef941c9bde092bb
font_02_sfnt_off00013063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1