Malicious PDF — malware analysis report

Static analysis result for SHA-256 e630c85835cd9721…

MALICIOUS

PDF

68.6 KB Created: 2021-09-28 14:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 56a7e9692366a8eef48eb7bb6c575bfc SHA-1: abdbbd77e4dd483bab40efcd59c5d69817568047 SHA-256: e630c85835cd972152c9886cec2394ae7d588aed2825d1ce1c0e6a5c1d176df2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous disposable domains and compromised WordPress uploads, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://bolshunoff.ru/images/wysiwyg/file/93741235090.pdf In PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/xuwuvikukij.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/jatorojozetogobetumej.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/zulepaponufomeporeruz.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/54872991315.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/xibesodobovo.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/45446301248.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16130d73a2b498---18122654846.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/42157302692.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/65058906423.pdfIn PDF document text
    • https://finliz.lt/i/File/74596031056.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/fewajuzegerexevutos.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/65682585214.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/digokupovuto.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/nasogeximidetatedugi.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/jokanilotetezovi.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614652cb105ea---lofiluse.pdfIn PDF document text
    • http://poorclarescork.ie/images/11041971592.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/24795308480.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/61361853609.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6b1509fd5ad920c8da9ac67758e5d8a7/44453748999.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/rezexagebutokudolej.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/reluxilenu.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/xosonivowarelanekisimuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=worms+4+android+downloadPDF 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_off0000afb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFB3 14652 bytes
SHA-256: 212d66d7947b43971fcc16f796bcb404058f53efe72f4448b083f6c35fcce787
font_01_sfnt_off0000d3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 10336 bytes
SHA-256: 2d3e03d489402582108fd3ddd0ebb6d1fef0064a59e431e49057da0daa322193