Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f9d84e2ff7ac340…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 17:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4557868a43a0a4ca04745326d71400dd SHA-1: 142b81c2fb05308466204894d48cb8a99560984c SHA-256: 4f9d84e2ff7ac340317f717b243e9c685d5bfb4eaa442637e4c839fe860031c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution campaign. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of external URI links and the overall structure point towards a malicious link distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://securitydm.rs/slicice/file/wusozes.pdf In PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/09drtcef3uqe0ooh6m063j9sge/48450627315.pdfIn PDF document text
    • http://usagimatur.com/files/others/digoxikovozewubumix.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/66997233750.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160850ca3b7875---fetakisixanamiwijomem.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607aba931a583---vorixu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39a8648d9---85326513680.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/kibakow.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/1042073356.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/fidabimidizov.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/bigagewobigoli.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125f556346da---puvadugefinipuvazi.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4cf350aeee---37559459695.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/97678667253.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/86348040815.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/lunetokivesogegefikafow.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fc50811ef842c1225a432a97290a2cb8/jamizopawujejagatapu.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/6218020650.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/vilaferabokoxifotap.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/q3cc055lgj1agl5cbof00tp3t8/mifunadafanetasigo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665298adcf---41267163404.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/84708559350.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/nne8ef3koiuekbab7u1kpbsvun/medugulizizuzi.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051122042765.pdfIn PDF document text
    • https://sce.tw/uploads/files/60faeb7cc0643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=class+9+maths+ncert+solutions+chapter+7+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_off0000d1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D3 11232 bytes
SHA-256: 0aa82424a8301ed916940f83cb829bef7c07ff2cf603ec4730e4e80ff0430d6a
font_01_sfnt_off0000ebfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFE 17488 bytes
SHA-256: 6fe5461d40e7e4f60c7c1affafe4004f7bf7c9c9172d5bd4af6f00d6681a974e
font_02_sfnt_off0001187f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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