Malicious PDF — malware analysis report

Static analysis result for SHA-256 93cbf299e4137911…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 08:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 72799000f9ddc8d44e4f35d628348e38 SHA-1: 9a982382e558348cbab754fc35bb34953d6fde4b SHA-256: 93cbf299e413791195d5a6cd6d64e10c35a98fe2380e7a3b0d9bb51e60b84206
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate it functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://neboskreb-irk.ru/uploads/userfiles/files/denozimezem.pdf In PDF document text
    • https://sayurmateng.com/contents/files/86512314477.pdfIn PDF document text
    • https://heyratacademy.ir/file/87584015285.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/poniso.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/jagoboz.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc54351db4---11591048787.pdfIn PDF document text
    • https://mikc.kauzi.org/uploads/File/15319113.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/89707670442.pdfIn PDF document text
    • https://apra.pl/files/file/38195571624.pdfIn PDF document text
    • http://agt.es/files/galeria2/files/94141135710.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c20231d00---garimijebuzo.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/zisibajasi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428710879a---lewufalozajak.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/gemonivevovo.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/murir.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/wizotoliva.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/gadowoj.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/74821336628.pdfIn PDF document text
    • http://daonshop.com/files/fckeditor/file/mizelajor.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/44227531053.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/55957848946.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/wixekukodujarewi.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/7157555427.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/89513520276.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/6429756661.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/25098047924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=radar+gun+app+for+androidPDF 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_off0000b4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F7 10372 bytes
SHA-256: 756cfef0f604d693228b31bf3620826e87dd5a82c4194cfd98dc4541145b6bb5
font_01_sfnt_off0000cc41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 16892 bytes
SHA-256: 18677f54176694aa0bd00295af404ffbb70643d08a156c42dbdde9057d20d668

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