Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd01dfbbe2a3a95…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 14:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 67886ccd12b9b7b52d7699e7a9fd0f65 SHA-1: 911d7c3447c5de7b9d248c213fdf1c699534c867 SHA-256: 4fd01dfbbe2a3a952bf54e9cb313a3fd0b8ec5dcf4ae57f670233034ee47f4fc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised WordPress sites hosting PDF files. The presence of embedded JavaScript and the ML classifier's high confidence score indicate malicious intent. The primary goal seems to be directing users to download further malicious content from these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd01368b1---menoxinaxunedakaxemu.pdf In PDF document text
    • http://abwrosedale.com/uploads/files/wusugopate.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/vuvonox.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f4bd5712b---xibinup.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/48136658232.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210919_127C6FA0C7A13904.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/14826658830.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109151831256259.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/46418687351.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/65884763812.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/4495111901.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/malena.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/paboji.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109110623164871.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/kakonisupopo.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4bbd39ece---75736483520.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/rokab.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/11509518650.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/98957810145.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tezebiwakoniladu.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/fevojepejemutexokuxoroko.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/l6up49mjk84fhbpgmev6fu8sqb/23060872660.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109051633559600.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/49539562703.pdfIn PDF document text
    • https://norservis.info/files/files/92213533565.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///zelololasidalobajere.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=yt+converter+mp4+freePDF 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_off0000dc36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 17304 bytes
SHA-256: 9f4dd26f23f34e6d31031a0b9b46d332dcff2eb9752959a3cc1e5c30969ed474
font_02_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 10300 bytes
SHA-256: 68ac7d540088521389bb558237c32d8e150d80f2b69145eafa65f242a96377d6

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