Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcd56a9018c14e2…

MALICIOUS

PDF

108.1 KB Created: 2021-09-09 02:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7852a07cb121669ba082b2d7271822d5 SHA-1: 6e29fd667c15ff5d28507a4daeac04de9417d064 SHA-256: 8dcd56a9018c14e2b83f8a97f518da5ea79f79fede55c85b5de618bb56c160e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers or delivering malicious content. It also contains numerous external links, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

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 https://brillimet.com/uploads/files/202109081634393242.pdf In PDF document text
    • http://njbeihang.com/uploadfile/file///2021090407433687.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/tuweve.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/44736345364.pdfIn PDF document text
    • http://cserepakciok.hu/xdata/file/81813968896.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tebiravevubasedifutuw.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/figapebakawif.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/tozeb.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/7991760288.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/juhrfp7rsn6h597ehia6t406mv/27684786056.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/43867971929.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321c55680ce---65206512570.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/fowalifegilogif.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/rijasesupetiv.pdfIn PDF document text
    • http://metamorfozyayincilik.com/userfiles/file/zodopap.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/ragudogelulunedilexokera.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/20614181399.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/e9f5a01b940723e4e56263fdcf50dcbe/36809227531.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/69601018691.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/simunetomubovejiwazex.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/04f84577bcf61055f7448a7c7d60fea1/77724159121.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613789c0c4cb3---97778653461.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/12491912952.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/33113152528.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/walefevepazafepekepo.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc82686f9---41395622647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=silent+hill+2+for+androidPDF 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_off00013938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001514a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514A 22192 bytes
SHA-256: d34d722247bd2f028c041ebc960b889e2953c3e1cc876577f6a9d63d3c05e2a7
font_02_sfnt_off00018a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A99 10476 bytes
SHA-256: 2b0d80c8724cb3678ef8c3e45cb2fbbdee2b0eefeb6f4ac75be39d8bad05e800

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