Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e9b09202d6fb48…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 10:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 20493881063fd23fa03f3c2645e8da59 SHA-1: de103f5c4ae2038efc9b982226bf852e576d43a0 SHA-256: c1e9b09202d6fb4822fdd2df717ab60f53822ab96ae90499c8621307aafbb74e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which appear to be compromised CMS uploads. The primary purpose seems to be directing users to external, potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://forti.in/userfiles/file/8696073161.pdf In PDF document text
    • https://hanyauntuktesting.com/contents//files/xotiworilese.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/85707444098.pdfIn PDF document text
    • http://santeh.md/img/files/zezasolajeduxovikusurab.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/papepopamogobot.pdfIn PDF document text
    • https://wittnebel.dk/file/doxoxobupabedevekaro.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/waligo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/27433601439.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1625139956246151803.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/ruwituto.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/fowadamugavakitedulam.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b437de7df03---34181140260.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/japegoxologasawugonisel.pdfIn PDF document text
    • http://likebarcode.com/image/files/20210703_225051.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/vekugafurizujukosijil.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070d35129bae---pimamupobozulaxur.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/zijokefunugo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cb8c9d3b8---80780282361.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881bd333290---85441220672.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c3f8e2726---60065119700.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/61229389589.pdfIn PDF document text
    • https://at1apigroup3.com/contents/files/19005730146.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/58802785a6567b2fb7225381b0131d7b/99161403274.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161086bc690996---zurobixumetesaxe.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210724040911_prsgxl.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=importancia+de+las+proteinas+en+el+metabolismo+pdfPDF 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_off0000beb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB9 17756 bytes
SHA-256: 95be5077fe1d01d413a0e94f1479ce9358f9470ad8e3acd96db8f35ef515e8c6
font_01_sfnt_off0000ec07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC07 10872 bytes
SHA-256: 8e1fd7ffff0d1bdd2648cb6e084d3d1fee436700774ee78cf00c49db534e93a3
font_02_sfnt_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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