Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18b743a05c24c45…

MALICIOUS

PDF

84.2 KB Created: 2021-09-06 05:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ccf1e87e71dc042b1ae08f0353564294 SHA-1: f0fad15e97e7d4c572c84820c0a52e9852b40465 SHA-256: a18b743a05c24c45ddcf378baf0e5537a674e0c0194f288b4aa943a5c8630d13
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, characteristic of a link farm used to distribute malicious content or conduct phishing. No scripts were extracted, but the structure and URL patterns suggest the document's primary purpose is to redirect users to external, potentially harmful, websites.

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://scard.vn/app/webroot/uploads/files/27787448398.pdf In PDF document text
    • https://canevastoilestjean.com/upload/editor/file/pirolekoge.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/memurorajotuvexojutifa.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8c1b62588b2a8611af7196f13bcc0a32/vumidopelozewikipet.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/58784519842.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/navelosop.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd559f58c---32353982205.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/zugupelikebagisebisus.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/b631c3a0e15613e7825556a1eb982c41/jaxute.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/12609609042.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/aba04t4sj3gem1s9r8nisg0r62/81162133266.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/33679912232.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/koxubijutemulase.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/96798402819.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944f2f0a944---34693683746.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52f1834fa---madinutem.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/8b8f48047d511e05cecbff2699f828be/12602750682.pdfIn PDF document text
    • http://capital96.com/userfiles/file/ledogin.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/fenelujuwizobesebarase.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/vuxilekizinesobas.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/juxijejiwarububozoxiwedu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c8bec56de873861d76e30d70d59e283a/sawuw.pdfIn PDF document text
    • http://palami.by/images/file/94387720677.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/menofupubavoluli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pdf+editor+windows+7+open+sourcePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/274fea0863cb73ed824c0e446a5064bb/31939321109.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_off0000e42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42B 17836 bytes
SHA-256: 3616234590cdd25361e2fd52434941bc2ce88d30ffde3bae9f31fc76a0b9c670
font_01_sfnt_off00011234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11234 10640 bytes
SHA-256: 287841b666bc01afa566caf386ce1ce4b857af2a3467d7e9dbee587ad7420c48
font_02_sfnt_off00012ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1