Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd592d85bd81de1b…

MALICIOUS

PDF

86.9 KB Created: 2021-08-13 10:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b980172578821fc75385e5cc9e2e9493 SHA-1: b022ba9dbf7171ba0be33a7d9afb509f490ca63d SHA-256: dd592d85bd81de1b00c3d78cd58cf3be589dccea5cfa7b0597980b6b18651dd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://wastran.ru/uplcv?utm_term=how+much+does+postal+tracking+cost PDF link annotation
    • https://lenaoyunlar.com/calisma2/files/uploads/xisovegekiwe.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b38989ad9b3---tibisifodi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/40073448642.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/56702556663.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/wakozajabaxow.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609794efb678c---76512164940.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/92379857826.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a03bf6aff10---76066540106.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/lekizofudofewajinivexarov.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/ead74a202f41c02bb77d46eb24a2c39f/jomiluruxunefusivefe.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/13286888169.pdfIn PDF document text
    • http://minipit.com/data/files/zivimojapanoke.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/6f3d2bf360c09c59786446b4eca7e693/saperixikawowekaxovipasun.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/lesor.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/fojofuzeruwetelo.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/42b2719d84d947d3e8e2bbe7db2f645d/54874325128.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/voxidufesur.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160793e87ef82d---67555377359.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/gokapelawolilulu.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/gitonimawotikaduza.pdfIn PDF document text
    • http://iphysiology.ru/upload/livaxajowawipukut.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_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 11228 bytes
SHA-256: 280e38c35123da80b52858fce6f7dca3b76893ba74184f029629fd3849d866b1
font_01_sfnt_off0001080b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080B 17248 bytes
SHA-256: 13bf42f02de63cbd68d03b3aefb628a69e7d127e33c55f5d1137bf4e48289ec8
font_02_sfnt_off00013553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1