Malicious PDF — malware analysis report

Static analysis result for SHA-256 95dd12090a46cb6d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 04:17:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 62dc1586df09c392378e98b894e78865 SHA-1: 6548d166c3fe4df08de7e453cf516218aad56db2 SHA-256: 95dd12090a46cb6d22f84cba040bb7e4d54ef2401f584b09cfa0d3b86f22f34a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious content, aligning with phishing or malware distribution tactics. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sysquare.com/UserFiles/files/53863387788.pdf In PDF document text
    • https://alteanetworks.fr/img/file/tafapupibesup.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/kezotowamebibazikusipelu.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/34870588470.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109032145006908.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/30518870230.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/sogadejisus.pdfIn PDF document text
    • http://klenderbio.com/upload/files/66606312829.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/dafiboxubaroroxizoben.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/82816556316.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3d5a8bd8d---roditimaxazit.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/fidomelixifubu.pdfIn PDF document text
    • http://proxima-design.cz/files/file/jonuledivu.pdfIn PDF document text
    • http://itfkarnataka.com/cvsprojects/SSK/Source/2.0.0/images/files/vukaxeluvomafuvemev.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/13174402293.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/wexefivukek.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a90d1ff9a---42346888189.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/rumupitefipukitevofe.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/wawarepenivogadiwutibup.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/vosujibatulodevusobinaru.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478c8521609---21623768356.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/69029001659.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/zitij.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab8e2790b5---24066386708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=my+phone+is+not+receiving+textsPDF 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_off0000d7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 17780 bytes
SHA-256: 63ac14b970b5ce92992e9beb2308e8084120c8f5cc217e1b696a6c37d86c9c9e
font_01_sfnt_off00010627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3E 10720 bytes
SHA-256: b18b4b997077fca397c073aef893c72a5620c758ab76ff245aaa1e9aa98e872e