Malicious PDF — malware analysis report

Static analysis result for SHA-256 282671875e970c4b…

MALICIOUS

PDF

97.2 KB Created: 2021-09-03 18:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 748787fe9ebc0b89efb49c3d43a71fd5 SHA-1: 215ae89ce0f8b33ec1720d3acdad45c8af8b6899 SHA-256: 282671875e970c4b5acf62670af8217592ff27220cad412c8ed80cc3765bc97f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress sites and potentially disposable hosting domains. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://huntic.ru/uplcv?utm_term=assets+liabilities+and+owner%27s+equity+pdf PDF link annotation
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa00921a35a---30421513438.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/lawunoramomima.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608549e7bd237---rinufotudaxixejevisemul.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/838fd1f340df0c3300a9cfdf13b22e5e/tomivilikijesidelur.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc7932d1aa---gutifibosutojutiripidebev.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b907aa2d0b---87178222467.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48b1b7273d---takulusubojajun.pdfIn PDF document text
    • http://pb-book.com/user_file/file/wolosutujukurujuje.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/34945094328.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/tefudavuluwibiruruzad.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/gibubumemoxuzedanowozaze.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/petisuvijijarasiri.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/99405288141.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210505222045.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160f6dccb04d36---gewonasemilugasukiboxe.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/10571602716.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24936425912.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac59e49ac21---45419627953.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083eb6a7e554---45630711078.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/torikuvas.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/pupivewomalevivixobifa.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/verudefunisi.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/14521903551.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/votijewukef.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6b281efa9b---jodazu.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xatabigiwajorapuni.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_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 18852 bytes
SHA-256: 7526795ee1e0d230e3a52cbc6c8b471c45a542707af5b6be7b4017b23560a020
font_02_sfnt_off00015ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE7 11092 bytes
SHA-256: 3845b8694714390e81635064a053af5cf3cc06e13b8c34b4e21a85821f0da43d