Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36c9dce4374390a…

MALICIOUS

PDF

86.6 KB Created: 2021-09-01 12:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ea5be41738babe92b1e56ab8fe9282eb SHA-1: a2c36c85403db7b1cc5381514cf0626f46b0c2f9 SHA-256: f36c9dce4374390ac9c2b6be6ea15930853400026cd49837127dbcba15d5ee3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or further payload delivery, while the link farm aims to obscure the ultimate destination and potentially leverage SEO tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2091fec3ba---81679742216.pdf In PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/2345839016.pdfIn PDF document text
    • https://atl-50.com/files/file/benufedowarakiborizor.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/58605240532.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f457049bf06---dusesipozetanogisum.pdfIn PDF document text
    • http://gardnersunited.com/clients/e/eb/eb3320446930dd457027df34457c622b/File/nukanagatefuzesovusalime.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/7pjnlgsacb2kiil3ba2g4sffh5/dunepurowepirolagovamakoz.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/pmra4cph2i7rf45mhljrvr4svc/dogokumatizomod.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/levomijevegugesojoxudari.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/baxigijenafetowuze.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c04f2be90ea---wuxakudixezobedozemunamu.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/18800935471.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/83328a77fd8992f4d0cf959c109753ab/pidupikinutopojoti.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/gitujitoxesulatifuwakome.pdfIn PDF document text
    • https://people11people.gr/uploads/File/13941069574.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/23429408158.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/kudarixatavex.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/guwos.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/154fef29537301aef891ce22a41ba9e5/838966538.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/28358355190.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/nokovikedomanewanuj.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/duvajaguvesepebojow.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/32921377239.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/netad.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/38586351243.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=tacit+consent+examplesPDF 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_off0000eb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7A 18280 bytes
SHA-256: 14be498c1484ea6688f2ac5f0f18aa547a67875e273fb26134b2edc8b8f5aa28
font_01_sfnt_off00011a97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AE 10500 bytes
SHA-256: 1a848cd027b41f31fee276ff5ca98b26f93314ea98d4bc48f4b2477255c1ce4a

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