Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bd115ebf817b96…

MALICIOUS

PDF

86.8 KB Created: 2021-06-28 00:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1433c83d0cff69c54b3cf61113f020f1 SHA-1: 3c5b7b4409ec45ca3c8a29e0c499b1ff5281b0fb SHA-256: 57bd115ebf817b961e76689da575cffd3d14fcae27a43d95b5430bfcf96868b2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/a7d7a752d7ccb61bf73d6649b0e79e36/23729825346.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d387ba3cf14---dupagebazowefujubeturufu.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/jewokoruwarutuseni.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a435e051a---mekafobajegesive.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/domin.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xonirasodivepoworireleja.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/eeb63f2962fa5a26dce3435bc73b9563/wikedibogatewuligatopusos.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/15116554338.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/b792cf856a5f716ef5b48eba77733526/rugenirowapumawe.pdfIn PDF document text
    • https://kermanrooz.com/img/files/40023478109.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/sufin.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/fekejatujabemejesagem.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607708d5cd085---jasedinizevugova.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54990e18e6---zavesuwor.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/92fe81d7c7fba02187c8232c6d6fbc1e/zuligexojetigoxigu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15b51ff3f---60374432646.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd20df0fa---80002876312.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad80f27ae26---67475528267.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/16023345175.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/rlmkl3cqh8rq6ovqoklgid506r/mowokirupula.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/6ab357ab0f70ad4ee302d95bd4ea12b5/jozopukapukilazutofijib.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160855d3bbe5ef---2237939168.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/60331511943.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160789d8dca4a9---58813864118.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/56eee7f6fdbdf4e1c6816791d9ccbbe7/serimig.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/lb4tcdo18u74lcerv0ftchn5o1/dafiwikesad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=example+of+condensation+polymerizationPDF 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_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 17852 bytes
SHA-256: 587761b2e16dfbeeb5f149d4d40d55fc9e1524558d784136a1fc5537cc80ca10
font_02_sfnt_off00013400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13400 11040 bytes
SHA-256: 4d41794305c5a25212f3328db19a9ae8f0f594e6b92a1e0b50a2b390d51334cd