Malicious PDF — malware analysis report

Static analysis result for SHA-256 318d6ae04bdf2ac0…

MALICIOUS

PDF

86.0 KB Created: 2021-07-02 01:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07711c7dabf3a262adb0c16879b1f325 SHA-1: 558b346e271a2ab4b778f1ed636028cc03353ad3 SHA-256: 318d6ae04bdf2ac0fed533edfeebd2b7c4911fb094cf5447447bc8b24e61a994
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple compromised WordPress sites hosting PDF files, likely to facilitate further infection or phishing attempts. The presence of numerous external URIs and link farms suggests an attempt to distribute malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/hr75ld4t4sffpfv048bjmkeqfg/rufejoludupiziwure.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d0803e81b7d21cb759a2820a149e0b4c/jaxedumoza.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5433cde58---sezotepobajimukekulof.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/e6b83ff393ec0274b900013b39d91ca0/8699176512.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3b4a3e12f0e07c9d6d77ba8ccc2d5a78/49222511358.pdf
    • https://infypos.com/infyposcms/media/67384430689.pdf
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/37405467602.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5eb4baa2---41699553276.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/dmdmnnamt4oheh9r54te7hi3ui/12105692722.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/8b06b50209efc9bea9bdd49a056e533d/famumaguletor.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080e93e100b9---26885409883.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf85247722---9556351972.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e69825721c291549d4889a6528a180b4/pepatexebejesakebedo.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2160d45a3e---bopaputufazuris.pdf
    • http://somsit.com/ckfinder/userfiles/files/menovuraxavikab.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/59acb99fdaf89a36941d712b60b6b7f2/sirirubimitew.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6c03dbf0dcea5acd61315f8805980d9f/13203182519.pdf
    • https://girilawfirm.com/content_files/files/60617472774.pdf
    • http://ausafe.net/images/art/files/90193184416.pdf
    • http://flambotour.it/themes/userfiles//files/32734719875.pdf
    • http://kristenpell.com/userfiles/files/diwapaxinamotaxabepaze.pdf
    • https://golf-tout-terrain.com/publish/page/file/gakoremefixetab.pdf
    • https://audit-advisers.com/userfiles/file/vazuru.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/tvuhr12kj2d04e26534ud4cv71/41414402817.pdf
    • http://littlefreddieking.com/clients/65037/File/83355138587.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=your+turn+practice+book+grade+2+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb87.bin
943851c1dbc5f7883100b41a3ce54e587bc1c480b576569e35b81157e12d44d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 17344 bytes
font_01_sfnt_off00011912.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11912 16792 bytes
font_02_sfnt_off00013129.bin
d3af26879a2f599aca19156d93dd69e76bd5ee8862b35f70e17557f16fc7bd39
pdf-font-stream PDF embedded font (sfnt) at offset 0x13129 11016 bytes