Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8597c7e1f0aa9e7…

MALICIOUS

PDF

93.6 KB Created: 2021-07-13 23:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a24ebc3d143c888f60a9ba628aab3de8 SHA-1: bcbee8c8552c034ec6094d5f4afc63cb716cc43e SHA-256: b8597c7e1f0aa9e7e0d1640f29c22f060db03e8fe4f35dd7e3802f527bd500e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple domains, some of which appear to be compromised WordPress sites. The embedded URLs suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/50814163668.pdf In PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/83709952017.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/60416571225.pdfIn PDF document text
    • http://proxima-design.cz/files/file/mexumedibedonuf.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/vazipixaxefesulijixenu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1bae74e7---tefajamitezekifudunopum.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/64386143011.pdfIn PDF document text
    • http://roocenter.ru/upload/file/90280366312.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90894c467---nuzaxobenopomugiwifuxogu.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a29a3475---zifidova.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5895828301---25297584608.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/mifabibep.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/5793eb715acc8d6d1932da10ac968032/pemonawaregivimokaved.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0559a90f4b---10955065371.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/diximomugafi.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/pikeneru.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4898a8794ff2dba7fad65654fc0b6b07/30972943062.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090e8fc1ed24---nigibora.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aae86228c---58024531527.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/71005269705.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/wevunobodojologulupep.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608832bd74975---kepilinabazob.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/kemirijejasomivewulexepag.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/gawojunimoxikip.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160849bca211bc---nikalerafejuzovatewako.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16082e81722116---10426541366.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606caa9703fa4---78544585973.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03a3b69102---30086746166.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cheat+for+gta+san+andreas+android+apkPDF 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_off00010a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A94 10852 bytes
SHA-256: 5b2b988de4b59a89c51b5e69e47d3df58ae17f1174dfcba83b7610ea3599c031
font_01_sfnt_off0001236b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B7D 17296 bytes
SHA-256: 6f857e96df399af85464b231b0512994c954dda95166e31afd43b56a2f20d985

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