Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e8fc75be6fd375…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 10:10:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 724580944f76e699e7bc3cdadb34b4e1 SHA-1: 9febf41662f1ad50abfdb13ace3dd16398bb8dd3 SHA-256: d3e8fc75be6fd3754b48d1de868ef389728047ba90180d6f0e71cd58650e8471
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to multiple domains, several of which are hosted on compromised CMS upload storage or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://basisnomor.com/contents/files/poluvurad.pdf In PDF document text
    • http://stmarysharipad.com/userfiles/file/regufizedab.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/fafomemebefoxuwofeje.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/15074441235.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/10075347741.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/97373341352.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/vejogirovupu.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/83324852751.pdfIn PDF document text
    • http://www.serge-valentin.net/ckfinder/userfiles/files/77053299565.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/99343458138.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/6625776302.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/71710340936.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161403f7937cb7---tajafigovejitepi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361d276b9cb---14014136517.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/58e521d3ec280960f68077b67bc0a882/77900135909.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb2687893e---34076182741.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/53151039060.pdfIn PDF document text
    • https://sanmuabancongty.vn/images/content/files/3888450736.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/zetazidej.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/lefomipeferulagodoke.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/73689607959.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/40454304503.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/garamojosemarusakurofifef.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/47602315387.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/96741608093.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/mozurulot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+disable+hotspot+on+child%27s+phone+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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 18280 bytes
SHA-256: 7fd023dffc007b23f25db9fc25d8744b67f6b4aa3425361224fe1aa0ddf0f172
font_01_sfnt_off00010c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A4 10860 bytes
SHA-256: 2ed7d813d4f1e4aa9c6c8341515f086ea599e09f8e8d510a74d56860faf4f212

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