Malicious PDF — malware analysis report

Static analysis result for SHA-256 9510d8c8c3f62e15…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 05:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90a849491e164cac2daa1719cb334517 SHA-1: ec14b7c485dae6ba9c9396cc97d9f7da4d131c1d SHA-256: 9510d8c8c3f62e15bcd865174708feed31226c06dd36b6acf72dfe6d2056cf51
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and presents a link farm, with several URLs pointing to compromised WordPress sites and other disposable hosting. The primary function appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/rikepol.pdf In PDF document text
    • http://www.parinet.fi/tiedostot/files/wuvumi.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a75be310828b2059a0ccdeff32c3111f/95826809245.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57278911142.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/43eb015f39d97f235ce4923e66181b96/91763945011.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/buzagewemeruk.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/46916794204.pdfIn PDF document text
    • http://artospace.com/pics/file/47610454177.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/piganizenelif.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/93128668692.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/48a11ec8fdcd0c5e7762f2f7041a30c2/wilozuxuw.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/guvobepidadanebapepo.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/31616160898.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/89571644905.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/83201500016.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/78047746133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=no+ip+duc+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_off0000cd06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD06 10244 bytes
SHA-256: 88b6649e1ae129afa1521be59b8f6edc505bbb35f47f471be5d779526502435f
font_01_sfnt_off0000e415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE415 17024 bytes
SHA-256: fd524816005fef5ecc7855d67cc4f34a274d72de9777ca2918bc05e049961419
font_02_sfnt_off0001112c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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