Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d751d1ee003bfa8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-08 20:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fcf6ee40f5005c0ce0190045dac9f45 SHA-1: 584abed522c3eb618c2e0cfcfa9a134881687588 SHA-256: 4d751d1ee003bfa8d14490a01c7e82b6f3fea5d10adb5d477c03c91e0623b2dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to deceive users into visiting them.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://coretry.ru/uplcv?utm_term=first+grade+sight+word+sentences+worksheets PDF link annotation
    • https://mariapolis.es/ckfinder/userfiles/files/67920387637.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/fdc6afc751nji8g25v90ungc0s/rukobabegesupukidelomum.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4944c40d5a5c97146fa728b484a9757a/82160015669.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613013ee10403---44484142434.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090602552721.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/69904497181.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/dobajaganewufup.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/dejazasirimed.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/waxuginusilut.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/zitijopu.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/rorebopizige.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/xabomusitavilapodorusip.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/56310442092.pdfIn PDF document text
    • http://dalaichau.com/files/darutizudorilexavivuvexut.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/xabaripegefev.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/limobasunig.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/60119743385.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/gigenomujupepumidenafev.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/nofolilolowufaxorililinib.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/kejot.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/nojixekedavowuj.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5e4665a1---mulumukozir.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/mezosufoxidiposar.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161342169adcb9---vizunatabinuvuji.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/katuzazijoruj.pdfIn PDF document text
    • https://samowar.ch/upload/file/bavisuvidox.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/74230575472.pdfIn PDF document text
    • 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_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 18716 bytes
SHA-256: 3c3b680af58ba5f25d3df95be7e321c893109424a053f3bfdd3371049c481847
font_02_sfnt_off000124f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F9 10756 bytes
SHA-256: 9b3d337aa23de4dc6c5f8558eb3f3fcd6dd5e103f0ac7089b1a9e0792a81e84a

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