Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cb3ecddc56d4b9…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 22:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9fefadf18b866f00bdee4a4a83bafed9 SHA-1: 7c5891916470b8ee598b51df34337205fec59efd SHA-256: c9cb3ecddc56d4b902261926d67074ba9e34a074d27be85c4a71cfd757f195a0
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://garglob.ru/uplcv?utm_term=pngtree+premium+apk+download PDF link annotation
    • http://gaytonfa.com/upload/files/18536533111.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322f700471b---58494041624.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/71357910671.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/78894189120.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/vigolaribirufajozulelo.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161337e9b40fcd---59038186721.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/60226365352.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/95880189778.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16143073c8d4c6---49707864341.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/36478336243.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/19524811240.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/puwenikivakikub.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/24263619833.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/79956090882.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1aceed0ed---86920081034.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/bh3qnnkl1qkvuf4vsmfvirurmb/94120588744.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/tanarumiguwuxatuzi.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/xorojarotokararolati.pdfIn PDF document text
    • http://15881588.com/ckupload/files/maboruvevonavajikifunu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/f52b0aba1b91e49183d3b5a90f9b8c2e/91819736612.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/netawegawomeliwisusuf.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/81568658001.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/4908874771.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_off0000e316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE316 10848 bytes
SHA-256: 3b8957f4f88b9fdb0945b84f8c2e395637068bc0d984b1c051fb50cf1f80e70a
font_01_sfnt_off0000fbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEC 19152 bytes
SHA-256: 7b71469cadb548ecc9ee7b686ca3508310f0f1668d8fe3b40f57a2d5e74dc323
font_02_sfnt_off00012d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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