Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ce23ece091d7ce…

MALICIOUS

PDF

77.3 KB Created: 2021-09-18 14:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56d5653221ab0ac9bba0a33132accac3 SHA-1: ffc56fa85041bb4d5f790808edc0f8bbdedc44c4 SHA-256: 18ce23ece091d7ce7851d9ab792f5afb7c7d4b9d2a057c6d53d70c559c2487be
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to numerous external URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links and the nature of the hosting suggest a tactic to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://d-a-s.cn/userfiles/file/xegonesorajugivitixoza.pdf In PDF document text
    • https://domilot.com/uploader/files/20431660617.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614266f84bc83---20185528559.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139087b4a1df---wivobuvemolup.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/97704455335.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613847ccf1e57---22027105730.pdfIn PDF document text
    • http://viorina-deko.com/images/file/nujide.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1c0053d94ad17601c8b9e509c224563d/gelotafavakopogaxejezi.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/4016568626.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/wakepopimifudofuruse.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/dutowezibawibi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/57890163428.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/113940153761350de37270f.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/kavogiwi.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/tatakewirewojujejiwujazul.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/nopekixobagovamoma.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/93443075966.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/21985801362.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16134c338440af---nipiruvisufijemiwukilida.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/pizewa.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109172151286395.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/26cab026f084be019ccd4a9d2cce9046/38242871496.pdfIn PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/53718461049.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/wuwixotipekavojokuzolige.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/1813570021.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1ed5e2c1c4ce4c204af124bf6f11b8c7/20398116817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=phrasal+verbs+c1+pdfPDF 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_off0000cb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2E 10564 bytes
SHA-256: 0271436bb900a7871e1e01ad932aa5e56273c01e85d2c2a3c66351a4c8ff59be
font_01_sfnt_off0000e33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33E 16984 bytes
SHA-256: 9c6bd5b5ac3263959eea705750bcafa2ace366fcb4a3e9c670e3b2a9449cf46d
font_02_sfnt_off00010f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.