Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff28cde52c600ec…

MALICIOUS

PDF

83.4 KB Created: 2021-10-06 12:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2f67c40e5c6428b560ca7b64f4300a8 SHA-1: e705b1ff455964af6506ad67a15cf807fae4542a SHA-256: 3ff28cde52c600ec6b2f350fc17273b193f7889d1c755af10511aa2a47e2d2ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign, likely using embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=the+book+of+the+sword+pdf PDF link annotation
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/52944810104.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/62356612459.pdfIn PDF document text
    • http://topbuild.net/content/xuploadimages/file/badefozutadur.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/xotajuxe.pdfIn PDF document text
    • http://seamacros.com/upload/file/87363637943.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/zirepoxupeluxa.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/10142281535.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/wokopisifafamutujunat.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/fivutakogovutixero.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16145d83e1c06b---zajunufanu.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/35251809341.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/vojavatifumiwovebifo.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/13257364346.pdfIn PDF document text
    • https://eastoncn.housemember.com/uploads/files/90462315815.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mni1gp9ai3vddfflsccv32q487/65516921937.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/gedafiziwubok.pdfIn PDF document text
    • https://inmasa.com/imatges/file/putobojagepuzesimigomez.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/97510855572.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/62733dd0046a58a1179d36c4b5937334/63719955013.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/15067405865.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161477ab4c7823---83659773437.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/91727790040.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/bududativazokopipapizo.pdfIn PDF document text
    • 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_off0000df55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF55 18844 bytes
SHA-256: c6af6730410ba87b7ccd3fba968da8c6ab9ad84e93c17602f50160779b71da25
font_01_sfnt_off00010fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEF 10472 bytes
SHA-256: f23434807342c41ad19502807448af5a09757fa665468d57388c88562738deea
font_02_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1