Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce0dcf8c012c377c…

MALICIOUS

PDF

91.5 KB Created: 2021-08-19 15:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a458c94b9ccdab0223f40cc705fe023b SHA-1: 47928d658fe4b8ed08ed61d31d4e3ab30c55ef81 SHA-256: ce0dcf8c012c377c3b9e15842a66a1a9fa1d10a874dc31fa77ae4451fd226109
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters suggests an attempt to obscure the final destination or track campaign effectiveness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/d438a56f771ed4d480382efd1dd3f24c/mefuwilubelenijodun.pdf In PDF document text
    • https://fallahi-sch.com/userfiles/file/41909015070.pdfIn PDF document text
    • https://a5productions.com/home/a5pro/public_html/ckfinder/userfiles/files/96568031747.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/sovomosiveziwokaviseme.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/b7facf06fac0cabd0a44d4f3a7c04380/23847757470.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/reo4926vrv2joncl2u9rr9jj22/mogelilupititawafosofu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/fab65b58b0d5011227bd2f6323cd8221/selifiwadokebebil.pdfIn PDF document text
    • http://japhina.com/upload/file/79981606181.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/96190771188.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/lumujitipepo.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b825f749f78---jojijuja.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/4246478514.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/nojafizamusudosiniz.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///puzizaletezuranerus.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100eecda473b---525475954.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/84359036963.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/a6bb79224673980ecd444e39ef8a967f/57707545924.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0bbf9a7cd8af1df06a540ad508ec030d/nifumupive.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/de747023e2fa0306773d4d1da25e4e31/xapeboxalexuxegiziv.pdfIn PDF document text
    • http://yljx.cn/images/upload/File/47078880654.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/88798866039.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210731_193324.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/lesikenosev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ions+and+isotopes+practice+worksheet+keyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eabb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABB 10808 bytes
SHA-256: ca74a2407789a51868f0a4e81d5e6c15f6bf781927e82b137f5690433fa15500
font_01_sfnt_off000103b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B3 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_02_sfnt_off000118f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 17624 bytes
SHA-256: 22c63f18446d4677e2074c7d92e1bd9b2a69374ea2ac72537888140bf2f436d1
font_03_sfnt_off00014775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14775 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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