Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb4ad2f3b0d436d…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 18:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 821df7b1e9c0a7b97e4e689b7b0e07d2 SHA-1: 2543d397004770030d3ddf7b897d22264d3fa4eb SHA-256: 1eb4ad2f3b0d436de2a88bfebc477c8b5d7d94037547d0e27692e2d0538edf2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the nature of the links and the detection names imply a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c49acbd84db86caec2630f1206a3c86e/xizapab.pdf In PDF document text
    • http://dakov.hu/_user/file/pipuliridi.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/xokakawe.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c202d5c17---jaxedawozobafamorubedu.pdfIn PDF document text
    • https://clubon.top/uploads/files/73887369963.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/12147822188.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/16221032380.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d52e364b3---89688547251.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/jutovefave.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/79361232404.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/nasuwomotireligutebolepo.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/43521638859.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311e24e6d01---manogapux.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/pogiguzowuzazij.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/23744948851.pdfIn PDF document text
    • https://phunhai.net/upload/files/42682066329.pdfIn PDF document text
    • https://dalba.net/other_files/File/18949434589.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16133817eea3fb---21221619233.pdfIn PDF document text
    • http://www.tivafa.hu/upload/file/76974742430.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/xukefep.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/joxujidekujajonatatenano.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/tudoravel.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/movalibuperudemajikib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+two+major+divisions+of+the+nervous+system+arePDF link annotation
    • 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_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF60 11032 bytes
SHA-256: f744658e41db90d055d4b7eff293e49cf35acc9f0f1f589abfe95afdfb62e8db
font_02_sfnt_off000108e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E8 16432 bytes
SHA-256: c786ce9382b69230b105731f3cf9bee7481a778f527fec0b71ae0576042827cb

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