Malicious PDF — malware analysis report

Static analysis result for SHA-256 7467b6c7d98ffc5a…

MALICIOUS

PDF

81.8 KB Created: 2021-10-08 17:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0a3d404812edc52b347be923633eba3a SHA-1: defaa7ed4d969003a52afb3e3eaa250ed11db6c1 SHA-256: 7467b6c7d98ffc5a3cabd7c2a4f5bf12f6eeb8171588b5a275d0fc9048e877ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc89586cc5---nepopumuwesosib.pdf In PDF document text
    • http://architettomontanino.eu/userfiles/files/duxajajewirelo.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/28873066471.pdfIn PDF document text
    • https://avukat.kocgrafik.net/upload/files/difimujifobokesemoke.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/birek.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615d5a34912f1---66036216454.pdfIn PDF document text
    • https://m-audio.vn/img-m-audio/files/sujenejapuxuxepipogikalaj.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/53430337697.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/lodimerifogut.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/tewezegujusogot.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b74def1582---60835790905.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/xofotenagobavivonib.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/bcb8078cc85635f8e2458fc7159ad8d2/82081827435.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/86117327597.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/vavametigativimaj.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/8235554661.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/51163074267.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/75555803755.pdfIn PDF document text
    • http://rurisnet.org/images/file/47011782264.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109231056328893.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210923120922352590uwfza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=copyright+free+background+musicPDF 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_off0000d5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 11500 bytes
SHA-256: 0b6c06604098c04d7592bdca187f17ccac3225bb97530a7502b4c9422d245209
font_01_sfnt_off0000f064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF064 19132 bytes
SHA-256: 842880ab0775d08bf71ab25b2247e10e8cba11ee4eebe45076ec0f7caf455d3d
font_02_sfnt_off000121bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1