Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82b9ada74b41412…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 05:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3d412d54d7d24b506d272b01e4f3b67c SHA-1: e58584ef9aab9542bab687c6d7dff4bf045eb2ae SHA-256: c82b9ada74b414120cf00693be442693079ebbf09402d4149322c25fb40f575e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple PDF link farm heuristics and the use of compromised CMS uploads further support this attack pattern.

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 https://fiscalonline.ro/app/webroot/files/userfiles/files/36577119530.pdf In PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160821ca006b3d---66365688427.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b98b8c32df4---tefivojujupitaxizekatevop.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f47cc2987c---69113466274.pdfIn PDF document text
    • http://ecole.ru/text/images/file/29935080047.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/fd96417469415cf7cd3a0b1a16c8c192/gavip.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/v178v1ji5f41jenma1d89ml335/napibew.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/559703095.pdfIn PDF document text
    • https://sce.tw/uploads/files/60f4459966600.pdfIn PDF document text
    • http://thicongdiennuocmiennam.com/uploads/files/diwogetaxobi.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/nujina.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/eidaloe7kbghfmb2lujj512to0/31921761251.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/ravopivovida.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/susefaxerawotewut.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/87630495404.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/97207208179.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/56821242072.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/2c91175b1339a53031aa50fecd1b2e91/14923538664.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wumewolenib.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/xejojori.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/75848117231.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/fepepivariga.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/61841857106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=postulates+and+theorems+in+geometry+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_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 11160 bytes
SHA-256: 80284cd664b542fc55911863a35cbe4afa109118f78c2d4ad93d327a3c32f9df
font_01_sfnt_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 17404 bytes
SHA-256: 3866467ecd35d87e268b5ae208ededb40e846209d8dbd4ea716f6c0c159dc04b
font_02_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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