Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd10e4743f88c084…

MALICIOUS

PDF

77.6 KB Created: 2021-07-25 07:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1ee21ddc40fde892a60e0156db0aa629 SHA-1: 3af947440786aced1a87d544bf2347927f8b93b1 SHA-256: fd10e4743f88c0843d8242d22891499c492043642138daba3d173e6ac8e0c892
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/526ff8912505f7b97e65ffc6b87cc8df/38288559477.pdf In PDF document text
    • http://eviljoy.com/UserFiles/File/54827438724.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f77b59b248---tepamebilepuperarowef.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/darir.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a144acc808c---gibezubenenawel.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8fce062m3sv0ogsjdfnpgoo7u7/mufisogepeziteposami.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/galilof.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/widolukebunemiku.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/4809396607.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/13563660130.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f87c42ba251d631c5ec15d3018658ffe/68060420482.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/goberobutezobubimoxog.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f3de3d41aecd9e5f5ee72c9758693e2/nugeluvufuvabonapekigoga.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607750ef5c388---71540782635.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092374f60b77---taxikotesedimejoru.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/dfb827e6d5f3e293f199e866d16b12b2/votupijof.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/ferekododurapivo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087150c19022---vuzazowizuraxupabirepa.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/wudilab.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/97078240306.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/borub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=advanced+practice+nursing+an+integrative+approach+6th+edition+pdf+freePDF 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_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE139 11168 bytes
SHA-256: 2d2e77c7c6c6dbbe3f63b72cc9f7ed9620510363936b01ab3c8fbd5ef3bf5225
font_02_sfnt_off0000fb1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1B 16112 bytes
SHA-256: e772855685b46200f1fed9f0a1397c9bee186ddcaa0e1435a150c668f7cbf873

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