Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e8a4d4f56efd1b9…

MALICIOUS

PDF

84.4 KB Created: 2021-06-29 16:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3297707fb3b147ed1395df2c628bd284 SHA-1: 3c79e59ccac8d93105fc5c4d1f10c46005146591 SHA-256: 8e8a4d4f56efd1b93cadd4430cad2dde5f375e2d96c4b8bc9b92913e0545c0b0
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 contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The PDF structure itself does not contain readable content, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/38721e78328bd2561bc2d72246fac0d2/segakidip.pdf
    • http://aeronautike.com/userfiles/file/92728890826.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f3934d7a987565b6332435dabe0e8f33/riloxasepujodibagoke.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160908957a884c---gajubopimonizededenobe.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d8803244f1deca016d1a8aadc09b7620/92379469799.pdf
    • http://tensoinox.com/userfiles/files/33852639492.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/5v5a8f2vv723la0fmiog3ev1ek/gobikokifix.pdf
    • http://atek-ent.com/upload/file/lilukin.pdf
    • https://havanic.com/cache/fck_files/file/kufipuwexaluwuxoguvidi.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/ff35579cdfb543c3133d135e0151fe2d/fefadaf.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c526927a4---bugenekuxip.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef4f0c491d52239390ba5474e6815683/42617083860.pdf
    • http://cerrutistudio.eu/userfiles/files/9971110614.pdf
    • http://drjoecarver.com/clients/49355/File/86015788162.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b9bab1f3---52504175152.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607214f1647b7---rinozevafiruremajo.pdf
    • http://modellszerviz.hu/userfiles/file/pelapejufezavodigix.pdf
    • http://www.anjhimayath.com/upload/file/87552167782.pdf
    • http://mosjob.ru/images/file/tugojuvisosorizipotu.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16070a7b18c3ba---19825444296.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084390087ad3---lazivivuk.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609458b36ca12---lediketabiwejabaxuxo.pdf
    • https://jbdclothiers.net/emailer/userfiles/file/tirusamibewegoziki.pdf
    • http://griby.biz/ckfinder/userfiles/files/namuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=apa+lecture+reference
    • 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_off0000e76c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 16792 bytes
font_01_sfnt_off0000ff83.bin
44fb59039ace152708577f053fe3800bc0a50c19e8579200407a86bdb4679054
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 10172 bytes
font_02_sfnt_off00011673.bin
93339b34677f7ec3538d47de01c26e3ff2594efd8e5de5d96af68905e72d0fdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11673 17544 bytes