Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b3b453a61c25da4…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 17:13:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 26add58db4a674bc11090934fcba1b7c SHA-1: cd0d0b38172ce3782b7ba90b1270b41313988774 SHA-256: 1b3b453a61c25da448ebd4b281f0c63d22f3c563f5439027781f3b4fb4bfd4f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. These links likely lead to phishing or malware distribution sites, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The primary attack pattern involves directing users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lica-mpt.it/userfiles/files/73896392413.pdf In PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b8e6a3307ef6597746fc416112cd6387/levefoxunutuxokeji.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/37014979653.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/20149087876.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16091bdf4e164f---tebovibimukijuvuji.pdfIn PDF document text
    • http://zerosquareonline.com/file/sogaf.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jai2ekurqot1t8d9eqgsduagpb/93388838511.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/iapsj0v6gphnmhevaalu85stnd/guwujiwibadapolupino.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/bidumofivarotudet.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/93lblft5qbeesgsrf1r98j52q1/79329521765.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/sazavoduwas.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/dexagixexanubewe.pdfIn PDF document text
    • https://parfumzone.ro/files/file/juxanusifidu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/jakenomatapesoxemefeje.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/21276579675.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/vojuwulefutoxed.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3e1f74059fd8a8af5187b3a04f91e337/11631698168.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b257792ba---wumip.pdfIn PDF document text
    • http://plafondchauffant.fr//img/user/file/mulaj.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/xitefowe.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/kidulodetawuranedetives.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/buhlpgb7cpvsehslqn6rgrmtc8/61001335726.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/tavegifine.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/549a9854b69c6801ad25e6794f1b4b24/49873288707.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5c8f3202---xokomifakuru.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/67438758539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=if+clauses+type+1+2+3+exercises+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_off0000e7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 11000 bytes
SHA-256: 47203127a3326a1e4588c09bed7a521dbb7ff1d889be106a4cc24c14a7d5fa26
font_02_sfnt_off000119ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CA 19700 bytes
SHA-256: 16a3a043d2c96cea34ebf54753aa10d62b28c9d7a92a68ae2889819066f1d952

Open this report in the interactive analyzer, or submit your own file for analysis.