Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9aae44b5e40d4d4…

MALICIOUS

PDF

71.6 KB Created: 2021-08-27 22:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9890ae96639337f9557fa52822dd9f4b SHA-1: 511dc08e9def484a53c8a45b180cb66654d2bd93 SHA-256: e9aae44b5e40d4d4697e93cee4c1118c843521fdcd411b21f9bd2d01caca71e1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://artecgroupservices.com/imagenes/file/12859148918.pdf In PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/6093541ec1d506dd060ea8be3ba01b3e/popisa.pdfIn PDF document text
    • https://qnzar.com/files/31136751490.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/vosazapoviratewakav.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/liferarisasaxen.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8dd4d46de---44441009415.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff9253ee9d6---48427599665.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2e8a84fa---gutonavifusuz.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/8752641001.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49f0a6093---likegujuxufap.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/xobirefovom.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a57e627bdc5---jotazofuzufuxini.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca23df21ce---3760137352.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/meliriwudajaxebefude.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/34910664933.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/49dd7c66354557e60888c5e39a42e323/dagilowamojirojijubopati.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/toveremipafen.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/93801346488.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/29cbe0fcb5b6c859e1b17ef2af7f728e/89236353653.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/86728075526.pdfIn PDF document text
    • https://uzunlarpeynir.com/dursun/upload/files/12887699856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=yoga+poses+for+upper+back+painPDF 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_off0000b77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77C 16100 bytes
SHA-256: dbcfb65663d03bbe2a79c800439cd4acac1a6ededbc65d8514c7287183e14c35
font_01_sfnt_off0000e081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE081 10824 bytes
SHA-256: 739796394207d744684d958c14a9be1addb32827d70326a89d5b4fb659b34a96
font_02_sfnt_off0000f96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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