Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a4c8e4bac0fd32…

MALICIOUS

PDF

72.9 KB Created: 2021-10-04 08:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4fcac04b12e8673d44bb152a237528b2 SHA-1: ba767336404a330028ca702f5a7a7b90bd5d2d19 SHA-256: 06a4c8e4bac0fd323e9dfa30a17e07ab8501397ea4d01fdf3b7eba146dbcc942
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://softwebstar.com/shop/userfiles/file/41147894000.pdf In PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/joluzizasulonepesorelixud.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/54264bbadf34a2e313eb112b5be9eb48/21935557019.pdfIn PDF document text
    • https://12waktu.com/contents/files/sorer.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/87415489918.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/56049475052.pdfIn PDF document text
    • http://hoachattn.com/image/files/94151591014.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140735b92601---fewuvarerefiruzodubavot.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0934003001630548131.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/80759948215.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161477c0ceb6af---67892120845.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/lajerajelejusumemuv.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/87500294435.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/7108698787.pdfIn PDF document text
    • http://custom-mugs-factory.com/uploadfile/files/lepox.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/kuxenafotodogulizoxu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/0nf2l62js5ctpmetsfl27q2eu3/60898831318.pdfIn PDF document text
    • http://cycling-software.com/files/file/xipokefosexofizijo.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/30184948982.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/27166774220.pdfIn PDF document text
    • http://hexindechem.com/upload/files/jumuzolenelusesufapejixaj.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/81028490556.pdfIn PDF document text
    • https://codecs.ro/images/file/mevuxawagawev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+farm+currency+poe+3.13PDF 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_off0000b4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4B8 10916 bytes
SHA-256: 550b35c62d21a503bd28f3eccfcb2beb615079ac73ae500bcc05f1a6595f602f
font_01_sfnt_off0000ce27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE639 18372 bytes
SHA-256: e4a1654e95fa4d109e04fa62d8eb4d313c3d6f782df5a247aa41a226d2740cd6