Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e199d8318b5aad…

MALICIOUS

PDF

70.4 KB Created: 2021-07-14 00:42:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e09f4bf10c6b2742af53bbc4a5b3dfa5 SHA-1: 6211adeffa47efc9d57c0c55057594c281afed2b SHA-256: f8e199d8318b5aadeb72441fad7ffb20858026369505acbd57a2821d5bb80960
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to multiple compromised WordPress sites, specifically targeting file upload functionalities. These links likely serve as a distribution point for further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab89cf25269---19597743644.pdf In PDF document text
    • http://secureyun.cn/uploadfile/file///2021070815001542.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a65347de21a---gufidotamidugesalegivitim.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090369c4ef63---mufofudomifabexekux.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/gurogakafa.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/53331387079.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/basofafigobu.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/mikoke.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/4065906814.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/lunituxawasosix.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce85ed2cd4a---dikaf.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/34728856132.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kj50479hvt091pa4knh2gidbk2/99755199778.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/sufopezuxonago.pdfIn PDF document text
    • http://gabortech.comadmin/file/debarasefaran.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086df9cba600---34716887041.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc61b572ee---lasapi.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/laxurupemozubozasenaxi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd89432c6f---jumexilidobosososak.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609832f5e34ef---sibulafazarepiwepaveziloz.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808cdfad423---bojuromoluvomagurevoga.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f813e899---fixebirogegujob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=vhdl+generate+forPDF 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_off0000b577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 10344 bytes
SHA-256: df4a1aaacb8d2fa15dfb977a3fd79f8e13d1532d6668195d4e57037d320c4d4b
font_01_sfnt_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 15576 bytes
SHA-256: 65db474e71230efa2802538d3589ed1d716441e5f1f7cf4a87b7196e4a2fec22
font_02_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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