Malicious PDF — malware analysis report

Static analysis result for SHA-256 61bda24ec6c0dfaf…

MALICIOUS

PDF

84.9 KB Created: 2021-09-21 02:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1a475ad115499ea49e0e1f880d98ce6f SHA-1: 1cee8bab5190d51b5d35f72087f263de45ff225d SHA-256: 61bda24ec6c0dfafaf22c9cd20e989cd52a3db671d9dbcfe2c93f0f6f7ce10d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/31408507409.pdf In PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/37923609197.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/seraximuzitirafililil.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/xugimexewubipixat.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/28292255581.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/823092eff8ff59cbf730ef355ec52070/temuxotijegofipala.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vumulewakobet.pdfIn PDF document text
    • http://4chan.ro/UserFiles/file/tisifumiwuken.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/21076769926.pdfIn PDF document text
    • http://ingore.cn/upload/files/buvuko.pdfIn PDF document text
    • https://eurotig.ro/file/juwepi.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/17595018707.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/rufuzonibi.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/61d171c21cda9d426b42366351a38c20/misemi.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/42235990697.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/98584316978.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/bukajaxoxuruwukosobup.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/bokow.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/43441025412.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e35c526e5e---niketuvokagiwonefolezu.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/23605825253.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/858344086.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/6769706282.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=setting+up+the+mobile+app+development+environment+along+with+an+emulatorPDF 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_off0000e46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46B 18172 bytes
SHA-256: c464c589b3229ea3923b0a30d25aa460f63da22127fb6cd9cee649fab778d1ae
font_01_sfnt_off0001139e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139E 11140 bytes
SHA-256: cb6a103ea9ebb185de897eae84cfc1057a1c2cd184146adc17c319c3600e77d1
font_02_sfnt_off00012d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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