Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c27a582eadb29f…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 01:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0920405cd4c28dc9f819586decf42939 SHA-1: 4d6c5d2d1f77a1ce610f520d032f9008cfaba70a SHA-256: 90c27a582eadb29ffbf3396eb2625d752474325d7c0ed1094eb3c08b780487bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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://wastran.ru/uplcv?utm_term=answers+to+the+tour+quiz+on+club+penguin PDF link annotation
    • http://tomboy2.com/images/library/File/jujezakonoze.pdfIn PDF document text
    • http://dsraxys.com/uploads/nuvufoxefezefus.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/77526498065.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/zidujoverojisesama.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/31586787854.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/tufikutajupa.pdfIn PDF document text
    • http://erpos.sk/data/files/susogalum.pdfIn PDF document text
    • http://kustari.net/userfiles/file/95499001169.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/23192541696.pdfIn PDF document text
    • http://na3.it/misc/file/mekuwalabepu.pdfIn PDF document text
    • http://ariege.proximeo.com/ckfinder/userfiles/files/14780463564.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/waromol.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/73072696574.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/xedozifiranipavubinag.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o4vs6d0rr0isqj6i59eijkj6i7/lidovumedagoj.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161566c0f3c9d3---nasekedimubujosi.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/latuxinurixikogeposasolep.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fed3baf980---daluvevexuwevefopinuzalaj.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bbjk5df8vf4dupdfu3l2qq3ma/92953760286.pdfIn PDF document text
    • http://dmkert.hu/files/file/40676089786.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/87290901351.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/62209305797.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210913_7ED0A3306AB09094.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/xozelefosalaxix.pdfIn PDF document text
    • 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_off0000af5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC770 16452 bytes
SHA-256: dc4b41d6adf268f536a8e1d81e2f2bf2370abe007065d5b63cb2825edc0a6fbb
font_02_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 11004 bytes
SHA-256: eccf500be2076fccf62fb325baabd775f9a36c9150957f75771879ea38e0ee17

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