Malicious PDF — malware analysis report

Static analysis result for SHA-256 00fe4290309fb583…

MALICIOUS

PDF

79.8 KB Created: 2021-09-07 01:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4b7a268f218177a05562565cf77677d SHA-1: 1a079ddb28591ee988b3d80829baddd0fd0ec27c SHA-256: 00fe4290309fb58390f93bc0d28d63c8c5bde0ec045678caa9253300c6c2e172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://pixomot.ru/uplcv?utm_term=nice+stroke+guidelines+2018+pdf PDF link annotation
    • http://checopharma.com/upload/files/71372771115.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/pifatub.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/ralisujate.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/6e3da99a50a63bb6b9933a49136685ab/77151921084.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/9474862493.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/89655952543.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fc7e57d3c6ddb8b19ac72fa3ab67f2a4/76345637634.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/28119912149.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/kesepa.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/vha51h52k39n0nq3vnvh9albf3/84487561609.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b776bd3bb42---30806251690.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0949ad8c92---gilokepefozevarilonot.pdfIn PDF document text
    • https://reniuved.it/file/gipotunu.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/9591048200.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10756114149.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/rabutiviniturosipibato.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/janiwoxa.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160986c6eab267---xoxokijelopilinarudil.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e3be3373af3328b1ba8adea6edf84bdc/54794821309.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd997b2d0e---23970561104.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/zusiripisujugutow.pdfIn PDF document text
    • http://hncastlecable.com/d/files/10662009135.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f1ade0fd2---sokaselulixapuzuxagesip.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gm3fim8htph9bba2tgb8o2aalb/63903585131.pdfIn PDF document text
    • http://nhhs78.org/clients/63854/File/lamafisefumofag.pdfIn PDF document text
    • 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_off0000cf30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF30 18380 bytes
SHA-256: 099335f54f5df6c8cd2732f50eaaca1664f1ed8924e4070ca2a3aeaf088c33b8
font_01_sfnt_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 11304 bytes
SHA-256: 27b6cd3e083de03345d157fcf1c900658dd42d3b2534c6f2e95b1a8d1deed02a
font_02_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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