Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b5572b17f03efe…

MALICIOUS

PDF

80.9 KB Created: 2021-08-18 17:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4797e3fc790c2e06d4a6b516e872208 SHA-1: e00d686be6469732310787671e9fc813133c752c SHA-256: f3b5572b17f03efe2c0f81f1f7262e6f91ea3e79fcd9761978ce553b0802ecc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites hosting other PDF files. This indicates a link farm designed to redirect users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://samsungklimalar.com/upload/ckfinder/files/pemuxedowometubi.pdf In PDF document text
    • http://acsalma.hu/userfiles/files/87511472503.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606dc27c74ff1---81855113319.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/13716ec1caca6dd6aba920e26c09b22c/bulawabisefipupodimipuxit.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/30693695689.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7ea9760b872e7c03f75374d68af9c8a9/27978138743.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f6a0c90f04b95066b6eec32c1bb786c2/zowajenalikegufiwamudene.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/mudufumodeninexuxidaziz.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5387141d26---zalepajuli.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/bobebewomigase.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/forawufitolimo.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea32bba88---33022606150.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/matowibit.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/begiwinupozakilunedopasa.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1d12d6cb38846a82a35a907afa05794b/28853700287.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/tsgt84nodmdbng7ba7mrebft8u/xufumemaxofogidimibe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608242fa12955---besasufabevivurop.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s1791sinkhg9ia7htvj2f2mhc4/69838842717.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/puxibesukaxopilonifuwux.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/zudujukavekajasupudofepux.pdfIn PDF document text
    • http://belst.by/upload/file/mesewelefega.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+my+roku+stick+ip+addressPDF 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_off0000db67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 10928 bytes
SHA-256: 3aff06da4a4b43682169972f71e3a097aae0bf07266a487912b707f83527142e
font_02_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 16064 bytes
SHA-256: 9e853a72190cde70e3ee87cdab599a4f5785a9efeb998262d06f02b92d1addf7

Open this report in the interactive analyzer, or submit your own file for analysis.