Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9ef83133c7bf9b…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 21:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71e9fb643b0ef66ed40b99ba60b80d9f SHA-1: 42d99f095510a469e54d2d36bc48ec540478e164 SHA-256: dd9ef83133c7bf9b7a202e6baf3253cb99d46eadcde9af595cb42eb33892ff6b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/5a6935d9b14f426b513fa4d97bd8df61/wakekejobexidajetekuwuku.pdf In PDF document text
    • https://louvre.lv/res/wysiwyg/file/bipidewapobo.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4e734922---58189645186.pdfIn PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/lokopofasikajanotidip.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160cfef5f8f77c---notawobejekerala.pdfIn PDF document text
    • http://hoskinspugs.net/clients/40498/File/davepadivema.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/32284811922.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/731d5844f7c929036a0352d4b712284b/93033120161.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be27ebdcd41---44909050597.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/17387855841.pdfIn PDF document text
    • http://byecook.com/ckupload/files/55269482129.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e66bf8a07b0---luripuweg.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9fd037f7f---lukoxudimameduv.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/12547187902.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/78709316525.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/59006419232.pdfIn PDF document text
    • http://peach2560.xyz/js/ckfinder/userfiles/files/ruvunaruwojogulab.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160921ab38c2a7---wogigigesopojupevedib.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jc01te3ijt70s3looqlubvfeq1/jotuvujuvuxe.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aed1831fb39---4617732488.pdfIn PDF document text
    • http://maksimetall.ru/files/desidaponumularibivalixo.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210621_976D13631EA4EB2B.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/4470887086.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/tenipimunotu.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b28adca28bc83ce8be0de111ad18ebc5/wizeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=36+questions+to+fall+in+love+pdf+downloadPDF 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_off0000dc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC06 11032 bytes
SHA-256: 079ac14ca8b63096047fad16c73e98c843b0d14e49b34c13d6717494b442dda9
font_01_sfnt_off0000f5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B0 20336 bytes
SHA-256: b7881a39bf95f50de522843e52e26783077ec5879b5838962834cdd8297608d4
font_02_sfnt_off00012a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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