Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fea9cb88cbc0b9…

MALICIOUS

PDF

86.6 KB Created: 2021-07-08 15:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7806bd711522b4a74b43ebea8a7547ab SHA-1: 9df3361cf2f231d1755ee53fb750f3f26ff9f47e SHA-256: 91fea9cb88cbc0b92eec2a81015ef2c9333d15a0ba0bfe8dc75bb6bd19709ad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the link farm indicate a likely spearphishing attachment delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a1f66c32---70531768467.pdf In PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/57d27a6204c0f784c0c7574cf41c2d98/16929255675.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/83561599369.pdfIn PDF document text
    • https://anfauglir.com/images/file/38539507.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/miwetiwureri.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/66711129359.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/947340d4b24e4302b8a509afdbf69888/37196611241.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/fejekebunode.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5b0b064e9586b529c5af355cef073fd9/21139368503.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c40a8bbb4---37718878047.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021063015474380554.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/if39j7oepdo7aj6755smq72583/mobidokevufizunakazo.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/07/03/file/20210703_044835_154.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/1f702201999b2e627dd784530b34a142/46190026701.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cef60343cd4---janejikadumatavovefukoji.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/65969523999.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/18e91f136b3ea6332adeee0dc6e8238a/30794572512.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/41480430703.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/95c922f90b384c19c204ba5b2822828c/jezaderaniwaxubumovebewug.pdfIn PDF document text
    • https://hagepoorter.be/files/files/fuwapitaxiwelowawetubir.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/78476687124.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/tkgnpc0ssb87env2no7nenvfbb/58623384838.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/20301528238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=exercises+for+anxietyPDF 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_off0000f0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 10480 bytes
SHA-256: 4460dd3c46699a4d58e7c72a3354cc9275d956832a84b7f5368781ce6e02fe55
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 16992 bytes
SHA-256: c7caee34fd273b8451e9a084efd864ba79cf7facdd10e053255734f3408a5094

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