Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdfbc6f834c0376…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 09:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c71b3834d8feb8c280dc0a6d0d6e2402 SHA-1: 623871f9dadf51e5dae8d279a058c51b6f5613cb SHA-256: 9cdfbc6f834c03765d4bee495fc165c6fd6f6c04baf6f08fcf7f120430e4edfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the primary goal is to redirect users to potentially malicious websites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=indikator+baterai+android+tidak+akurat PDF link annotation
    • https://fuoriscena.eu/file/18977171598.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/ea7daf7e32cae0e56652d11e1ea1bb14/99209469820.pdfIn PDF document text
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/zidapixe.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/892790861.pdfIn PDF document text
    • http://midel.me/userfiles/file/xekowegixufalobuvazemaduf.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/91276791857.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210911090248.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/qca2cif312gpl8dr4os33tg9qg/sonotu.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/tirasa.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/wenufumupeze.pdfIn PDF document text
    • http://mlight.cz/archiv/file/gopelel.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/31572874759.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/84446249327.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/v7tvg4kqti1bc4f101f92icpul/fapuramitokigofu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140f9ca20dcf---44394823998.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/87874254098.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/37645313847.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/87132832912.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/voduxipovepuxofovizudafu.pdfIn PDF document text
    • http://bigbazar.cz/is/images/FCKeditor/File/15796453611.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ace04df1---juvonufijare.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/remufufemilijokowiwax.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109131400081183.pdfIn PDF document text
    • 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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 16220 bytes
SHA-256: e4cbf0ac2511e795a76b39600d5758ce41b334a8df0419384ba659cda431ef7f
font_01_sfnt_off000108c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C9 10312 bytes
SHA-256: 01169b45b4e8be670adcbefc5b07ebc073c8855525837287af05c1d9a50e4934
font_02_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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