Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ef0f9411216781…

MALICIOUS

PDF

68.5 KB Created: 2021-05-11 16:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb9e28924cef43f5c8bcfc50013acefd SHA-1: 7bdb0f9fec6ed96a5bbb1d9e8872deb41d4df98d SHA-256: 94ef0f9411216781f110fa02082d86f5a4fef024d0110993e4494fdba2638071
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF file is classified as malicious, exhibiting characteristics of a phishing attack. It uses a lure related to "Checksur for Windows 7" to entice users. The document contains numerous links pointing to compromised WordPress upload directories, suggesting it's designed to host and distribute a secondary payload. The presence of PDF link farm heuristics and the ML classifier's high confidence score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080454a0781e---2671568427.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4b4bc2aea---93961342847.pdf
    • http://charivne.info/images/file/46821668009.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085835709cd6---bevanale.pdf
    • http://villa-carlshorst.de/sites/default/files/file/zonur.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/367a43bf49d0b184bb76a9d7c20dadea/jabivarevuxuz.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607996c96860d---82239099770.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/1a4d6d1740962d672ad581d86fcc7d7a/15207703018.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/0mq2qcm3iakospqf1m5221737i/vukatanomunipixalaxujimif.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca26b8008---27878243400.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/1d1a46c882d5234d564e6dcf64b8ac2f/71475519166.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/10a1527bd9e3cf09b57d2bbff174741f/76909843369.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc2a634fc8---16977689180.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bcd2502cb---88572626332.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d95ce3325d9468de686f2bcae0772faa/27173410286.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=checksur+for+windows+7
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a0.bin
f0b1e97f7407da867441301e9bc61371f948f357016c0e9a9d3f01966f20fa18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A0 5008 bytes
font_01_sfnt_off0000e7be.bin
c1386b9f187a2fff7bfae6f09e810209150a228d07a54c707ec4ff7e1850a8a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BE 10804 bytes

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