Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd2d9996b135919…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 05:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f21503f1f6c7be39a66bdccf3e64b0a3 SHA-1: 8005c3ae8f516a53ffb2e7a6c0ba3fd4cbac0f77 SHA-256: 0cd2d9996b13591985cef35f0a048929187b713c3f292780b27ec3c352967e48
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the structure of the PDF suggest it's part of a phishing or malware distribution campaign, likely using a link farm to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee5034e7c71---92080246055.pdf In PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/98388715017.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/18011610593.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16082de86424b6---35406030915.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d9859c518---11224113538.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca2dcbc30---66280957546.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/4085808174.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/zatisulenowe.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/88861089748.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/suponeniviwogefenoz.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/zowimofipeduwikap.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/39155510112.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/lm9fm5s61fjp84n7sbb35ac738/26684233376.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfb53cebee---wuxibijijuwedafan.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/nesurijav.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160d1deb0ef013---wepunuluvigu.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/91879947873.pdfIn PDF document text
    • http://s-box.biz/upload/datoteke/liwivamuxukumomoxolo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/xukogadimozikugunate.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a675b34f156---vojilesi.pdfIn PDF document text
    • http://teifsepahan.com/files/file/jowejoruwigidugojekapo.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/fizonemibavunefusuv.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/subiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bosch+shem63w55n+pdfPDF 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_off0000e991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 18428 bytes
SHA-256: dd6af5c398871f95fe3b43b97393719c3c30dc1681e553a4c4b8ef74db865021
font_01_sfnt_off0001198b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 11000 bytes
SHA-256: 6669189381361ae97c358128c0a55e4dcf5ce08c3628d51933cfaf1e39fec73a

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