Malicious PDF — malware analysis report

Static analysis result for SHA-256 251253d2dd8f4ded…

MALICIOUS

PDF

92.0 KB Created: 2021-09-02 08:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd4a1d0ee3755270a4b86556434fb5db SHA-1: f404162240d4c164a398c1bdc5c1022d9264532e SHA-256: 251253d2dd8f4ded520a2036e18f728b1716a91430f333bbf0556eb8f7a35744
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, making the document a tool for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fol2bumu208oc62aaubhcpr524/pusimuzujebojilire.pdf In PDF document text
    • http://jnafarms.com/clients/864068/File/burizalivuxu.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/556e91610c138d8fa5daacee0340c3ef/21485886485.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1baae3f97---fawaniwizaparube.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a1aff281af4---dovirenoxukafedodav.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/wowanexobotalom.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608998a311085---7252507617.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/56005713306.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/7d795a1200faf30cc221c2612f6a1f47/39063226602.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/57770301308.pdfIn PDF document text
    • https://signika.pl/Upload/file/jerasikiruziwinu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc92190bd3---nonusolowajurinexidafoxub.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/diligopekevefevoxizef.pdfIn PDF document text
    • http://foxadv.net/file/godavuwidaxujatelasisino.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/gikukatoribarokudev.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113c37eed89f---bunagavox.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/86403030469.pdfIn PDF document text
    • http://biomehl.com/images/content/files/vedevavavofetuxugunina.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/4076123066.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608648df91389---tetunutafivizelenibip.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075ceead69f5---perexobazuzugazabilovum.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51189130355.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a537728752---kakuligufas.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/c3b84fb0d2f5679fd655df8df0e17a4d/67807086637.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=dr+hawkins+map+of+consciousnessPDF 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_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 10880 bytes
SHA-256: c2806567ceee75ef18ed4f0504829a652c995286fe1f7f4c6d517c3792ccbd59
font_01_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 19108 bytes
SHA-256: 24a3b4616d74d0e439351997fb54f9dd8bb8c6fd3c7020819ae4424614c8dede
font_02_sfnt_off000148ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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