Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c9edc26b2fe0de7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-20 20:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5104b50a981e0330c55b121f76bbc124 SHA-1: 8296285a022fa3ea7c15da88fc58fca44772aac2 SHA-256: 9c9edc26b2fe0de7af55ce6a5890c052820733094b8f849df9c859ccf031a6aa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including links to compromised CMS uploads and disposable hosting, suggests a phishing or malware distribution scheme. The 'SE_DOWNLOAD_BUTTON' heuristic further supports the idea that the document is designed to trick users into clicking a link to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=pool+guideline+hack+apk PDF link annotation
    • https://vilnius.cvzona.lt/resources/img/files/vubexafunasetivoludi.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/jufexosama.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/81383330726.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/tusar.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/50878395933.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307ef31f2e5---jelijonevirikada.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/40175471021.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/wozelipoxemik.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/71348432581.pdfIn PDF document text
    • https://granitnet.hu/editor_up/rutodev.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109130141491143.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/bojodanavaxexoladivule.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161405a6bbb8e7---31709277286.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/sosajabumonif.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/63916958841.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/13550533643.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec4219ba11---xuburinigakakawuf.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/debolobaf.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/ofu41et6a0soutlh72e340nnih/63209892845.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kokenizukomawugijikofil.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/97078968956.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/93849200112.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/22205151473.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/ruzogirugokemokijilo.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/73206663086.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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 10620 bytes
SHA-256: 77f4798e1cc15269ae15b8d88ebf5148dd21ff2468f2651c215d7ac62ce0cdb4
font_01_sfnt_off0000f4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DD 18636 bytes
SHA-256: abc4a9a7f4311d3ad9d6619fb99f038ed9399ccbd807f0eb8fee30680e06135e
font_02_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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