Malicious PDF — malware analysis report

Static analysis result for SHA-256 821cb1ececf7a4e7…

MALICIOUS

PDF

73.2 KB Created: 2021-09-07 21:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9efc4ef14232a9d94f143f81e52a0aec SHA-1: 88d45e738303815e83b51d91f328987a3e4e9bcc SHA-256: 821cb1ececf7a4e7e5c29dd9e5ca5418f75321461c7af605a824c9f638da3ca5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the URLs serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://ketchas.ru/uplcv?utm_term=qualities+of+a+good+leader+pdf PDF link annotation
    • https://numberonerevolution.it/file/9983688867.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/mebura.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/87791807112.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/67f265450cbc4eeb9dcd437e86397abe/libivizidivimobamajakeve.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be55bef34a---kivix.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/tolepagej.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/12455528690.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/musif.pdfIn PDF document text
    • http://quinta.cl/upload/files/jemebewazegabi.pdfIn PDF document text
    • http://a899.net/userfiles/file/22328375234.pdfIn PDF document text
    • https://majubesar.info/contents//files/buliza.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da76bce9f---jigexisiteloromupofewi.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613122cd0979f---wisupalaripete.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae66c5be527---duxuki.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/nifos.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/sh9igqa1ffr5sk9se6g2561fr7/vazatofase.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd42abda0---wetasolojesoditonerifum.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/wiroxinan.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/61974331479.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2f3db9f4b5802f593a0b22092bdd85d4/misujodopowawiginifisij.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a6c0a9d522cd67d164d350584089f03b/91123305164.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/63592545936.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/tagevaputetariruvulabo.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///dojizer.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/mapanidagevupi.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/31744870211.pdfIn PDF document text
    • 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_off0000bfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD5 10728 bytes
SHA-256: 748d69a86f1b0f5d1b21f0f77c3f9b4b581fe4ddcf534b4ba7de0ab9faf88a4c
font_01_sfnt_off0000d87e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87E 15312 bytes
SHA-256: 0aba4f77772df4b266d2f7b7a71d4f0e85e9fed2946f87ce2507eb09951eba87
font_02_sfnt_off0000fed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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