Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d4a49872252ded…

MALICIOUS

PDF

72.8 KB Created: 2021-08-09 17:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9158ef85a891146b778ae6d30f04222 SHA-1: 41badf34e4df97aa6dee8d6863d4c4b411c44c51 SHA-256: f6d4a49872252dedb2b623862f618438b44e26fd45a0e4878dcf9ea6f898abbf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting domains. The embedded URLs are likely intended to lead victims to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91623164e8---62809712910.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/b9melgrnd2205crejug3nqj1u4/95957735998.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e9160e278d4---43113125475.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/45266996757.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/21208723444.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609000308b7f5---56294288621.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/31635448471.pdfIn PDF document text
    • http://17njl.com/userfiles/files/toluzumetirizunonigadasuf.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/nivij.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160da8e335181e---47590634130.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3d3f76c32---11312521227.pdfIn PDF document text
    • http://canvangdientu.com/images/file/36445001243.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/23614335672.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cae520d7ad9---fapavinelofevomezodivewa.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/gededizabufojenezi.pdfIn PDF document text
    • http://barexkft.hu/userfiles/file/61656907733.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/97055672784.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6a20f01433d8d648c30dab6c9626c0d2/4612054780.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab43bb4c832---rifijiwakukib.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/zowanixe.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef053a2ef2---tisixijuxifof.pdfIn PDF document text
    • http://ezibra.pl/upload//file/84580423095.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/584525409aa0da5142456e39396dab4b/zozufizekosavofefafulelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=anatomy+and+physiology+coloring+workbook+answers+chapter+9PDF 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_off0000b9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9AA 15812 bytes
SHA-256: fe561d67b369bd7bd41999ffdd83ebd938e46e9af9147005060696628a90069c
font_01_sfnt_off0000e222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 11540 bytes
SHA-256: 9da9380f2efdbb3e70464877f52013014accdc1eadbbdc317817123c2b008bda
font_02_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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