Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da4323dda28782a…

MALICIOUS

PDF

82.5 KB Created: 2021-08-24 12:00:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6fa8ace501267bcbf47a05d7ab346b38 SHA-1: 2483f223892ae0471d0c08514b16a2478724a861 SHA-256: 2da4323dda28782afbd224782e16d6329c47bc2e4c2889f81b4a6852457f8757
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, suggests it's designed to host or redirect to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure the true destination by using many distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=carrier+infinity+control+troubleshooting+guide PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b006fe5ba60---larelu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d047e5ade1---bojezibiwojuvujawojijesu.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/66981975705.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d76bbfae746---nalefibekasutefu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/o7938me1aaibtbmfc9l617l0u7/wijilineragobuxesukiro.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/nugijedinafulimuzotef.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/rr0q4vjsulqsib90chvk97bj23/kepotubama.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/789054542.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/gemugexatoxoge.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/gutuwun.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/91519996315.pdfIn PDF document text
    • http://orderkai.com/uploads/files/duken.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4u2on4904uli2cmtf161226qo6/91742844540.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c13030b50---wurazeruz.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210516214341.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/marokubuzapinigiwebinofaz.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/2403731852.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/4638112380.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/cabda61ef9155ffb37cf103e5ce1d4d7/xebudopakiz.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16110dd67d2ff0---woxokikenopogakafez.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/pubirulenojirigelawug.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/1855babbc7573761f33bc61b81ce5c2e/96399392345.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/nesazete.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/kopibi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/vhetg0kkdtm6ltqvhmcg3c5knn/vofisakapotuk.pdfIn PDF document text
    • http://dgjst.com/upfile/file/19344691813.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160838830bbd33---tododaneloxasejitum.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_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 11140 bytes
SHA-256: 53b806e88fc0966fc5048aed94d29fe8ba4ee744ec1ab1c60a8fbe7c8367f1a2
font_01_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 16772 bytes
SHA-256: 1ac943394c159005a7d21d7b0036c6bfdbcd1096dbb148f3a771bfb7b6bf8d39
font_02_sfnt_off000121c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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