Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ca48a9ec9888b8e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 00:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: df4def61ca468baf50010c7d34501b1d SHA-1: 84416e341111ee6c930db2fa8a394c1f169585eb SHA-256: 7ca48a9ec9888b8e823830b9aebaa8c673608fa1396f577a7be2eb44c410664b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, providing no further context on its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://playindiano1.in/ckfinder/userfiles/files/movafo.pdf In PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/39082965202.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/86310681532.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a704adeeefafa7c0d95411f87a82d499/rotulipokugewaravuzogos.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/76917861630.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/74703486151.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614101fd96b37---80065469367.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/kufimizuzajino.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/basuvogezodosupobeselopas.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/940433fe586b155c08cb8522c1fb1d5d/juboxefum.pdfIn PDF document text
    • http://riph.pl/userfiles/file/najuligesudaju.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210908121333_zz8dcm.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/pasutazavuk.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kivegabekozamizivajo.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/98761723498.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/55052623896.pdfIn PDF document text
    • https://ewt.cz/res/file/71210214124.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/11786554719.pdfIn PDF document text
    • http://gtshotel.it/images/file/nifiridibujexenedakud.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140ccfb8a136---bobozo.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/bajumuzorugade.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/94251448466.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0ddb2b0d---naresumokuzofebof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=android+speak+caller+namePDF 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_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 17288 bytes
SHA-256: 08f29bf2249bd84a3208afb77c77faf0c772ca7bc35b99c45b9ff0cb3492c6bd
font_01_sfnt_off00010ac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D9 10652 bytes
SHA-256: 73693c6fe1dc3ef5d50eb6458da708df7b3d4ce46801a36ac139221dd81adda4

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