Malicious PDF — malware analysis report

Static analysis result for SHA-256 45283a900215198e…

MALICIOUS

PDF

148.3 KB Created: 2021-08-02 14:23:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4284cf607307d30e720c9cb4761f16a4 SHA-1: e6033393dd29d341ca9c23f9ec538674964c6bd0 SHA-256: 45283a900215198ee286aad5f5e276ceff482fa363628a3e0998d1020d9fb0c4
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 6

  • 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.
  • 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://ipic.vn/userfiles/file/65693145648.pdf In PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/eacbc95a9efe1854242489fefb91a0fa/fiseno.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/rotitopim.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/s8k42koo0m8mr20t0quprnn5bk/xewuwuxanimun.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/17791753142.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9b084ac81c2a96012082a80973bd1fec/retukameneveje.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/1447985253.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/fn8omf5g0nahp173ilv8hrsfa8/55272580882.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084a82a0966b---dariragaweluzirebemadox.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/mowobifima.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2a9273a064d10a72fd9b3e727c478da8/36735373954.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ed814f7502c149caacad6be8d2605db4/99650783762.pdfIn PDF document text
    • http://awkontrakt.pl/ckfinder/userfiles/files/90018873775.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089cbf0380ba---kogutinazozutitemovot.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/83849193294.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/82111690160.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/0515115af90a51f2e36ad530b4b0b03f/nixok.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/puligikomelosakesiwat.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610347ba1b990---sajatijejedixozaxuligobo.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1a5c4312a---63788050764.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/juzugip.pdfIn PDF document text
    • http://vonkoenigsmund.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d29f383965---39645028168.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/girabugeg.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a62c6b167b---limikaberemeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=level+1+car+logo+quizPDF 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_off0001df5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF5D 10416 bytes
SHA-256: f616b6cce08c14245b78f88b5ae82037d30a4411d177badf82459c8e6cac35fb
font_01_sfnt_off0001f6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F6D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20EE5 20636 bytes
SHA-256: d624746dbb33022b63ab7d59e99a8833bb29ad87fc2de984b223bd2b703c1430

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