Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c1c4cd911d05f2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-22 20:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 009e3dbfa2a84ae17cb99c3000961bfe SHA-1: c7d47c6d5589798f6a5a9da5a70379d57e811280 SHA-256: c5c1c4cd911d05f2e4a6e13baff74c62dcfd7bf45f9db2cff58b6dd5310ae815
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Several embedded URLs point to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The primary function appears to be redirecting users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://kartinatv.org/uploads/files/88787808839.pdf In PDF document text
    • http://sahamit.net/userfiles/file/poniruwigapisekefuz.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbe5adc34---78212475207.pdfIn PDF document text
    • http://fantacyhandicraft.com/userfiles/file/8005157171.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/10915520861.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/89359870028.pdfIn PDF document text
    • https://eslms.com/userfiles/file/18973823355.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/kaxidafanebajipixover.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/tejupavebuzitikomulutewos.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/vefivamudisaji.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae92ee3826---wegezugugegoxarironige.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/87647707173.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/xamadupimemorub.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/jukus.pdfIn PDF document text
    • https://petala.gr/userfiles/file/tesugaragelesi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f08e55ed86---derevusodafasole.pdfIn PDF document text
    • http://ccadl.com/files/20210911223629.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210923004922.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/76090045202.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/nubuwutabitorupajeroza.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/26052508877.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=redmi+note+10+pro+fingerprint+sensor+positionPDF 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_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 10852 bytes
SHA-256: 131446aca338c676ef2d7f456a2690039c36510d7bc0f348abdb6cfef55972f6
font_01_sfnt_off000100e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E1 18648 bytes
SHA-256: f367bda9d50ec27bc396d0120acde9017e0c9c52474c1821ad79995c334e3c95
font_02_sfnt_off000131c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1