Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc708ad777bf60b…

MALICIOUS

PDF

77.9 KB Created: 2021-09-09 09:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61ffcd13324e3d577e3584cb952dbb52 SHA-1: 21f5fb08b1f9b98b9a4ebad8d5d841546fac6562 SHA-256: 5dc708ad777bf60b61ac8409c2834c22ef2dac78868fc40be6d32c4c54b1c27a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to link farms on potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nsmpublicschool.org/slbdavbatala/userfiles/file/78700266568.pdf In PDF document text
    • https://nmcs.ca/userfiles/files/rizewimofawatujazak.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/jurobevonekageromegakazoz.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/10823920578.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/badewusisaduf.pdfIn PDF document text
    • http://aurora-c.jp/files/files/19759974660.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/78458550970.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/regoko.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/92074329890.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/lutupewafivo.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/2019290895.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/7806ffc7d8a654651c81dcc488951ec7/lifig.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/61804658152.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/kinafirusud.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2728f093cd6a80f8e55c5fcb90cd63ad/88515359658.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/rijukegigubizirubilet.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/zevofosujerimifen.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/podolofozi.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/romuzawif.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/rigixoguku.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16138fde72e037---janikudarofodibunakavos.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/25758417821.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e6a5063f64f38efbba4a2859aa3cf394/garizewo.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/51216122763.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/61625238832.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/86849671370.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/xonovusezijujexefemedef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fashion+story+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_off0000cddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 10356 bytes
SHA-256: 6ff3a0356283073f5b4611fc916c25ba895496edba9973d4c55c671a3e12e233
font_01_sfnt_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 17248 bytes
SHA-256: d6b6af635a44a04b0c1e29982839c66d5e6961a5d10401aa9ef8ed52ad553adf
font_02_sfnt_off0001118d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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