Malicious PDF — malware analysis report

Static analysis result for SHA-256 428cf5796c6524d9…

MALICIOUS

PDF

94.6 KB Created: 2021-08-01 13:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 335ad3f8ce6fbb48def9daf70f596ee3 SHA-1: ceb109535695bc9342b5bac44b55d4f079106281 SHA-256: 428cf5796c6524d92de56a2b445f4d02f2c89c3e83469b1b4b861a685f603116
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The presence of embedded JavaScript, although not directly analyzed for specific actions, indicates a potential for further exploitation or redirection. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608467cabdf3c---70464138584.pdf In PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f5c5edb71e14779aa196260473f17f00/54980511173.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/216ea8447f69ce139b8f2dbe51980cc7/zofuwowepofivugijod.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a735b490c8---jomatodudujuzojopo.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/ginugaxerubepoxaviropib.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/wusexokixepitufezujaj.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/biwufaragunugigisu.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/ligudunefofadek.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/89818771075.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/mrb2lj1fnuenjldht4fo2a3447/viruvixavanuwuweko.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/ipfpiuh956srab1pou5u1miqan/totuzipurusavaw.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/lolotevelelawedadejixov.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/93187703687.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c10a1edc00---lesowenifuweti.pdfIn PDF document text
    • http://servmed.net/userfiles/file/sezefuliwujobisodavobo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e12349946---luzexovedipemizebivat.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/l5dk12c8gjc3quj7d4tu03fh6d/xavofeto.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/75221159638.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0f0645fa18f2b3a76853edfbdae042cd/senagekorokofazaj.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/xuvavimevugus.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/liwesepaloxaduvejinurow.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210622_184855.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b719f24ed---65637760224.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160af570fcdc31---30018336722.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/50228445083.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+muscular+thighs+without+equipmentPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/81134148236.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_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 17308 bytes
SHA-256: c24d43c1408ab1d1b0ded912339069acb345895815bb3d98f0197e0cc7e19346
font_01_sfnt_off000139ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EC 11144 bytes
SHA-256: 1fde14390c24458efc59854e22f25697e5f02635c9411bdc1953a15d3c126c10
font_02_sfnt_off00015381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.