Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d37a3458fe58e5…

MALICIOUS

PDF

77.0 KB Created: 2021-09-14 06:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89884c09957351a7da06e6c5e00f2e75 SHA-1: 6e618464041e3700e0e710bcf4cdf7bb2539646d SHA-256: d8d37a3458fe58e5e207b8f8d7c5cb71b12f23e7ec3eadfab5793700908d7694
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, several of which are hosted on compromised or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the true destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://junona.manyel.website/images/uploads/medium/30132531119.pdf In PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613f643a669f8.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/zoripu.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/53561138734.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/14898664817.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/ruwufelaziluketufegefaxas.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/xonul.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/68634731548.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/27170352668.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f642117126---sabupaduma.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/lasasit.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/dusedigofidujesenefubosol.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/87674366571.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ah76uad9nfeoolvdsjn65b9os6/pefubemonumowulumedaf.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/26195988112.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/kinukapegukela.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/13966887046.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/78010741167.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jiliwabumefone.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16139a8c1de70d---wimudup.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/5721195959.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/mabusagusoropawit.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/pokino.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/74277043943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=totem+and+taboo+freud+free+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_off0000c1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C0 10556 bytes
SHA-256: d57e2b96246928c524e5c0b1af987f9f6c6bf31facb1a315302b43b9704a5ced
font_01_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 20260 bytes
SHA-256: 2cd1ade9ee19ee8ff74a2fb9aa411a85360c3215d3fb2c8bfe6d79e527ea9e01
font_02_sfnt_off00010e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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