Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd3d41e0c9771e02…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 13:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e153f7ba47e8792ad6b5ed7a5c9a20b2 SHA-1: 2514a368a190147fbeb45e8dbf9e0a4a10abd7a6 SHA-256: dd3d41e0c9771e02392d66a7e3136007eb4e73d08c66c6350f226d0fe8449838
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting an attempt to lure users to malicious or compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document structure and link farm behavior align with common techniques for initial access via malicious attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://njuhome.pl/ckfinder/userfiles/files/sulufofajosaxani.pdf In PDF document text
    • http://nextgt.eu/uploads/file/mazalufuxexixebifanisepe.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/63671711487.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9274ccacf---bipuvuraguvo.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8u73hp47nf4mt3rk004mdd7f7l/2616455552.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/e70c983656fa7fe32b480780a98d8781/pulep.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/sumozoxoferedujijitejifag.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/saliferasakodalefeta.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/pudukusajus.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/44271016073.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/xekituwomejik.pdfIn PDF document text
    • http://kdekdyjak.cz/data/bekevaxefog.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/c8ca98a711d72ab2a57afafeee51cfea/jepow.pdfIn PDF document text
    • http://nlureunion.com/clients/33063/File/kodipuwivajerebasepegov.pdfIn PDF document text
    • http://plncse.hu/php_data/file/fuwutuwugexepikenozi.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/b2a06aec2f32bd8a363330405c57a42e/dopuvedukujajuligopidel.pdfIn PDF document text
    • http://thecrayfamily.com/clients/36408/File/verevajigilixapelumoliguv.pdfIn PDF document text
    • https://mollis.rs//files/divulejivadokifezup.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e39aad276f---luvaronega.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/sanironom.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3f9d33428cb7e150aa091680e0738608/buvirovo.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/pumuruxufid.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/34399926835.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160807c5c09be2---35685532618.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/numit.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/73059218793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=steps+to+solve+word+problems+in+mathPDF 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_off0000dcf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF4 17720 bytes
SHA-256: 0ece43b9f36d2bb090e0ad1f3c4de0945190c593bb1198258326336d1b852809
font_01_sfnt_off00010b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B23 11024 bytes
SHA-256: 0610cb91b3341ce5b0bd9e5de7a9087181819a7170b647b348cc4c120fe2bd17
font_02_sfnt_off00012456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12456 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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