Malicious PDF — malware analysis report

Static analysis result for SHA-256 c210da483d056061…

MALICIOUS

PDF

79.2 KB Created: 2021-09-12 05:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3614502ce2296bf585981363d80501b7 SHA-1: b3b02055c1874f23a3ab8d6c4d9aeb76c6eb86ca SHA-256: c210da483d056061479b100ddf6145fc3a93f8fbf3ef6aefcd3bb48bb07a82ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to distribute further malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://hotel-la-licorne.fr/userfiles/file/17184256586.pdf In PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/lajuwazuzag.pdfIn PDF document text
    • http://xhzhengli.com/upload/56542486715.pdfIn PDF document text
    • http://timebymtm.com/upload/files/ginenimajopezaluj.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/30396120746.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021982019568371.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bdcbb59d4---muvanenolasolutixu.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/lonodesefuf.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4pj0mh6c6jktg9l33qlv27jr7h/55673163276.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613958fe880bc---safat.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/muxatovetipune.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/36490220235.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/notosesux.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/xotuzogivipodo.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/48630923047.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322e486b429---47866199276.pdfIn PDF document text
    • https://webmenuplus.com/images/file/nijetagixetamufedubabu.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/fidugodupiwovejira.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/sesipuroli.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b126cc926---90445762704.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/sawamodu.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b6bucaqfi71p7d0k2rghja0sa2/21114660185.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/87394076347.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202191263382877.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/10844044977.pdfIn PDF document text
    • https://wecareprogram.org/images/file/41025422694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=minecraft+pocket+edition+apk+full+version+downloadPDF 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_off0000cf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE775 10952 bytes
SHA-256: 6956ad5a02aec6c3ae7d45a1cc36e74f4d9d2bc39fbdec4399858959509cb24f
font_02_sfnt_off00010109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10109 17572 bytes
SHA-256: 99fc464f8483150cf8b09a1f720c83b49f0c85453108301619ccb48580778eda