Malicious PDF — malware analysis report

Static analysis result for SHA-256 790d370a23eda79b…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 20:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d715b5bef3d56703692be0036cab00b SHA-1: c6672a15956ebdf4a567926be2a68ff17a5191a6 SHA-256: 790d370a23eda79b6e936af36b2d19169b34276b1b28825db20a60b0633929ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting PDF files. This suggests the document is designed to redirect users to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa541044f8---jusorudovufixewirajuw.pdf In PDF document text
    • http://auapp.ch/userfiles/files/tomubos.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf0e6c268---82038194697.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/8vc0kq7ubuge9lnmog79egjns3/40736054045.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/40057559661.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/14650802473.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/jurifolojuzuxuwaxaz.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1ee3898d9a17a43730802296dc004648/53182933193.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/41218cfcdbd000fff482a596237bf76b/jipasuvozorepekubaborone.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210629165948.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/romulutegejabinabaxufoko.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/dijorex.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/55693636463.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/xojonuzuletagasidi.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/lifefavizulodijatoguru.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7d81c1114cecdbc18625ffacccfa22e4/damefos.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16120bda134fe5---34226494880.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160902133ecc5d---55690557107.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/onldi66o6hk54b6blplnneb9og/damurugibapo.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8aea3154b---jikakivapujefabizabuz.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/lilizunuwedujir.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/47ef5cad5263afc37c0d2969245e9704/jigukukokusukuz.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/30259e96a3022add48d4520d9758f152/58419749285.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/bominipuku.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/kejekavuzagumebiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=whirlpool+dryer+manual+wiring+diagramPDF link annotation
    • 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_off0000e960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10172 17920 bytes
SHA-256: 84e5c83d05b279073fdb5b0d0781ffac2e96750c01c75f3c4be10af498b82253
font_02_sfnt_off00012fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA8 10868 bytes
SHA-256: 4db2fdc2f6a6dba931523299744807249fee29eba0b749c06323abfff8524315

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