Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d048519b528c39…

MALICIOUS

PDF

76.6 KB Created: 2021-09-04 05:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f46e24393a1bd422ae494cad770edbcd SHA-1: 878c43080594c201d7d8dee8000bb3500aaa8ac9 SHA-256: b0d048519b528c39f99d6e954e1594e6a771954c3307cb3b916d8661997876b2
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to websites that appear to be compromised or disposable hosting, suggesting a phishing or spamming campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://promobryansk.ru/userfiles/files/rukusifijovejujaregubu.pdf In PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/42163058210.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/98457255831.pdfIn PDF document text
    • http://harckocsik.hu/userfiles/file/mabulovusimubuwawefi.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/5eecd5fad8ca01d8e0ebe3c956aa2f9a/rivefofi.pdfIn PDF document text
    • http://btfa.tw/upload/files/nexidabejusuruwo.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/zixuwakewedojadow.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e20b8ccddf---10787940632.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/15869200752.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/734c63e0b49c539dc3689c6f0ffe2cee/23001343353.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/goxogusijexuxogepufu.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/gtmd9mu6lbj11h05u58luslkb6/4241726659.pdfIn PDF document text
    • https://actor-conseil.com/files/file/tofedifuwodolimevo.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16126ea3029e58---89306271808.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/54982699429.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076ae5642968---nuvusaregunif.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/56020441829.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/f194ede1e93af33fcf55013409030985/mijadidipafotoxitijofa.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/53803039353.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/srrb3bjct1e336mu0ed5bbp39o/7244692600.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/petuxazujisesadegaran.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/da7a571976ca1c6f602ed79f2430e1ab/loledasugalalu.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210812021542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=convert+pdf+to+wordpress+blog+postPDF 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_off0000c4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4F2 18196 bytes
SHA-256: 124d9057d3d7c7f448cdde2335befdfe4bdb6d3632bc3560f8a100899599ac8a
font_01_sfnt_off0000f3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 10740 bytes
SHA-256: 270b8eb9f05e920c4d75ae9d8b839adf2438b81f4db2af571bc50ce1b3a2a8b0
font_02_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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