Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03aaa29c103c1b7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-11 20:56:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df9761a5b23c7f80fe0cab3a1fef7331 SHA-1: 2c524430bcade95792a42f3aa32b7e2a128c6a70 SHA-256: d03aaa29c103c1b758cd2082eb3ae0219c841cd8b7b26f608baebd0820e7d514
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The presence of multiple unknown URLs suggests an attempt to distribute or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://adams-gold.ru/archive/image/file/dagederejalidiraxamugin.pdf
    • https://viessmannboilers.ca/fck_upload/file/29929861349.pdf
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/40378901017.pdf
    • http://helder-effect.nl/userfiles/file/66725493476.pdf
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/kusarebawavo.pdf
    • http://jj-metals.com/userfiles/file/2021090316190473499.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0cc8e572---69990880440.pdf
    • https://on-call-anatomist.org/ckfinder/userfiles/files/48502696997.pdf
    • https://zahidnawaz.com/UploadedImages/image/46042163638.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161312fa30d441---23697817119.pdf
    • http://pluimveebeurs.com/userfiles/file/tevefefulom.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da2880c8c---8512778856.pdf
    • https://ducthai.vn/userfiles/file/32169555946.pdf
    • http://oldmotorsclub.com/files/file/xabajo.pdf
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/85812226561.pdf
    • https://photopoligrafic.ru/ckfinder/userfiles/files/doxizo.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/0b3fdfbc2a12e9276dde25035c4f63b0/fanibulixef.pdf
    • http://svatba-emi.com/uploads/pages/files/36312166430.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138d32d77034---70498543214.pdf
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/tamilamefofoxidasubepades.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/831368f7ab8ed92e81ac3f12dba0e4c4/vonifirepelev.pdf
    • http://gnox.vn/upload/files/39444679960.pdf
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/remubiwejupenobanu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=windows+android+7+app
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d68c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 16792 bytes
font_01_sfnt_off0000ee9e.bin
cf2f67a601e507d860c301d90658a243aed18adab536a3024cb07b4bff27b448
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9E 17728 bytes
font_02_sfnt_off00011bc2.bin
788d4d5dc762a47b39a80e68fff3f8855ea9e545e5efb1e55ac1035f4f7d25be
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC2 10236 bytes