Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2c9cf5bd95ac1dd…

MALICIOUS

PDF

86.5 KB Created: 2021-08-24 04:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1aa54e0611c7e8a8463d801b15809e9f SHA-1: 359e32a0b3fb76030b3118690d16c7eac9db6dcb SHA-256: b2c9cf5bd95ac1dd34429ea60c0f676853ba89ddc541824b31cc9e77f1032f54
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports maliciousness. The embedded URLs suggest the document is designed to lure users to external malicious content, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/fe0112f510dafe651925002b03dab1a8/boxepit.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8c4fbofrria0vqfs6kifqj3296/1171028713.pdfIn PDF document text
    • https://nevisnews.com/userfiles/45467830578.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/68376007918.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/2j3vhbr0req1odpmivrmff2jfu/50700503142.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/noxamojo.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/zetesajuvorajebufisud.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/gimorolulinijoluzoseru.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/70965246666.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/39611660396.pdfIn PDF document text
    • https://actor-conseil.com/files/file/fusezagej.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2c19d800ad9c45a03c6e4d297da34b49/vemexomuwakezaselexe.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d5673e4c6a01657803bcfd83945a603f/61851163784.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/39206535127.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/43433887109.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bfd1b15b8---murisosariri.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/74737162753.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/ic1h4hgefavhke81dtpcvobet3/71463647409.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/98355372179.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b04afaef4da---mokejesokopulotizebese.pdfIn PDF document text
    • http://congtyvima.com/images/Download/52610046731.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1216ddf00f---duxamibipuwibirab.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/86407881812.pdfIn PDF document text
    • http://nktrading.qa/file/files/karowovaza.pdfIn PDF document text
    • http://novena99.com/uploads/files/202108202326213363.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609062cf8e7e1---94901064968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=academy+award+nominees+2020+best+picturePDF 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_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 18840 bytes
SHA-256: 58462a5840aff654130b17873ab914686ccd5a5bb2eb106ad1e7cc89e690e78e
font_01_sfnt_off0001182f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 11292 bytes
SHA-256: c0fec9efc7bd75718202c68de8c117c575367f84b48a607fbbba09662e240db7
font_02_sfnt_off000132a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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