Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4d8bb4b78bfa84…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 18:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d7904d46c147c0f4afda17eb53debc87 SHA-1: 14055d021811a501d6dbe72cb281c13717113bc1 SHA-256: 1b4d8bb4b78bfa84cee26051b6f6103226866006f2db288a10be699b048ac2d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to external malicious resources, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddfa149818b---88144133694.pdf
    • https://uppersanduskyrotary.com/cms/files/File/50578992559.pdf
    • http://archinfo.ru/uploads/file/pededekiwukopemixi.pdf
    • https://szabobuszrendeles.hu/files/files/zobamorokidej.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dc105913a5a8e532e5bada9b89216a57/87034646840.pdf
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/korezesovinebonaguraxegog.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/88cfc53659f21a2555c9b31e370e45f6/galipizidasopipukike.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607450ae00241---92416560168.pdf
    • http://ilovemynewstemcells.com/clients/865932/File/sobetojebugibikavaketi.pdf
    • https://ancoraeducacion.com/images/levureneburosutanuson.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/b9519763cd71a4fb78f46086af4556c9/75554057263.pdf
    • https://twinslock.com/ckfinder/userfiles/files/43174714448.pdf
    • http://vako.vn/app/webroot/uploads/files/71548981152.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ceda310a8---piwelo.pdf
    • https://ntct.dz/ckfinder/userfiles/files/kulezipi.pdf
    • http://begemot-rus.com/uploadfiles/file/2021071221332973499.pdf
    • http://alexanderjamesbackcatalogue.com/userfiles/file/favevo.pdf
    • http://kepco-group.com/uploaded_files/userfiles/files/zenuvudududelojulo.pdf
    • https://henklinders.nl/henklinders/upload/files/diwisopifubozaruluzow.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/b25bc2f3d4ecf3bbfe881e7b829772ea/rabixabevokamuxetaparu.pdf
    • http://ankaser.com/userfiles/file/bokegexotarurozuni.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/d2jc64fqtnif4sa2ms2q9eaeh1/22270375529.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eedaf3694---satupof.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a7d7564d2---wetafuliminewalebim.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c783eda1763---razugoderenoxuwo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=marathi+to+english+dictionary+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_off0000dae2.bin
34d547dd09321b2b9161c8a3363eac480328507797efc78351fa8fe8fdb88c81
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE2 18944 bytes
font_01_sfnt_off00010bb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB2 16792 bytes
font_02_sfnt_off000123c9.bin
d6170971c3dfbd49be1a8d2fcb4eed79fdd9d2e95777d140e41c64aae6725d37
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C9 11004 bytes