Malicious PDF — malware analysis report

Static analysis result for SHA-256 c35cec1761b32534…

MALICIOUS

PDF

75.0 KB Created: 2021-09-10 20:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7db5a4b4431118a684e5a383eebd48ce SHA-1: 85d345fa5215c2763806d8604c0380c9a1476abc SHA-256: c35cec1761b325347cf204cd567053c936332bb349e953ce34416167b12f8ca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous external URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate that this document is likely a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=the+elephant+queen+online PDF link annotation
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/79108552f865add275016008abe295c2/93086833408.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/mizozixapozesirejudeviki.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109041913463890.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/tuwisodirof.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/9100057235.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/8d2d136058582c08e9ec25e57cab759b/kavuxemimab.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/balidudutonaruratufeva.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/tonezowigigutumulovisi.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/2266710497.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/pinupigupujaxodun.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/puxizamafozaku.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/95364852030.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/48492244578.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/54093051837.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161330d239bc60---nixuba.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/19603822049.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/delarodozagatokewugubaza.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/puses.pdfIn PDF document text
    • http://elpijisystem.com/file/dokuniwuwe.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/3m8a904e0m08fn9ah5sfh2jdkn/76601030182.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/38320845981.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/zixipepezusaxixoduf.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/gajixa.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/takumizura.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/33485699211.pdfIn PDF document text
    • 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_off0000bfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC7 18248 bytes
SHA-256: 2613f44cd2fd3b6260806abf6cf6330ad249b750143822b8d9aebce8f034dce4
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 10292 bytes
SHA-256: c4772a4a8d79b95b00c667a6292e835d4888615bcccb86f39d88a278587d8bed

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