Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b8daaeb4a2bb71…

MALICIOUS

PDF

106.7 KB Created: 2021-07-03 11:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 145e3ec5af2520437f8d5ac81c8b1296 SHA-1: ce6a5e91e9298e36130be791d087605e07eb7bca SHA-256: 33b8daaeb4a2bb713c56b72fedae07fc086a891f64773a851abbb4ea52bd53c0
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://synerhu.ru/uplcv?utm_term=how+to+leave+party+hypixel PDF link annotation
    • http://bienbao.org/uploads/files/16615043101.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/9f6c7d415cbeb681a52145fd15f2bc98/jofusutepoliporeveza.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df4b4ffed146e50ff6d3302e44c24319/vedusiwoviparariwedolo.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/wumopeditebudewekonovakur.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/12702540975.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b2son4cdh1psmo2jcu0d9mpee2/33940572161.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/peliwitasipe.pdfIn PDF document text
    • http://bjjiffy.com/upload/tafipititurituxesolid.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/1d2cfc174da7d05e3a4481d2c29c63ec/10326816856.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5aa077b26851523b61ef43d2c77b53c2/74463212915.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/vavatamiwodisawip.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fc9ca1120c40f291307b0db8f9ce5bb7/jorisovagigi.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d45e2a5c3e---44663907144.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609620e8756d4---xirepinemimapojure.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f4852acc4988c72e5234f9997ad071bd/jibobejim.pdfIn PDF document text
    • http://vejwun.cz/images/60981020623.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b18b6c0d6a9---pebapogukoxekuxajusubavop.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa708b63a3---16612723706.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/eccof357ds23sr8c61gp0u4pef/99043272716.pdfIn PDF document text
    • https://penal-garazh.ru/files/dedorum.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba1771456---73056838602.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/66e3d039a57a53fdbb1c23476b54427f/wosogujijowosidowagudov.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/femeduzanisok.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/39484009975.pdfIn PDF document text
    • http://asfalon.com/__files/file/gepinobolilinufezoz.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_off00013f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 17992 bytes
SHA-256: 5b0a12537414efb8fbbcb7b37c37c46a2ba0572685ac940b7c595958f580d7e3
font_01_sfnt_off00016d9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D9F 10436 bytes
SHA-256: 104eadf7e51bdfce5267f6aeb349bbfbee6adfcddab44b6ae0a04ac29bab32bf
font_02_sfnt_off00018571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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