Malicious PDF — malware analysis report

Static analysis result for SHA-256 33147d04f32cd390…

MALICIOUS

PDF

69.5 KB Created: 2021-10-02 09:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 84cf623ccf4e5ae41368946af960dc1b SHA-1: 300beabff5b87f28a3b6bdc4fab6966890b94180 SHA-256: 33147d04f32cd39062fc15b3670a4016e3941972f120fdf4a25af6ef0efb2248
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://epwuae.com/userfiles/file/finajekigu.pdf In PDF document text
    • http://prime42.ru/userfiles/files/98005500659.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/44720164543.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7p8i9cus8ficce6hpk5gjget53/tetezosur.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eap9i3d2mslc3gcokdjuu9gjph/deragiduwupig.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/66412703309.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/gemomujokojikewexo.pdfIn PDF document text
    • http://hydrem.ru/images/file/puwuropirorizodazudekuku.pdfIn PDF document text
    • http://agriturismolataggiasca.eu/userfiles/files/31392929367.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/winuwurepudupexesorilim.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/69302175094.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/dosaxoxemumopumarefa.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/pozun.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/27200050253.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/dopimudidotezarizetidojal.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/85177375088.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614482f13ab98---xixisazaxitirojalezolobu.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/mogunu.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/16384740404.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/tunukixa.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/28848398376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=most+beautiful+places+in+the+worldPDF 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_off0000aea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BB 15836 bytes
SHA-256: 684994d9bd1310f5f0c5f973f9f83b27b950ec915a73e2bd0dc179e83e7d29d8
font_02_sfnt_off0000ef32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF32 11036 bytes
SHA-256: 39df4ba4017088d5e7c24007f0cf15ccb25f45948f7f10f91cc79047d95bda97