Malicious PDF — malware analysis report

Static analysis result for SHA-256 abac19bd44a8138e…

MALICIOUS

PDF

78.2 KB Created: 2021-09-19 04:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20d8e403b2deaf9e2268f16e5d78a6ff SHA-1: e2826b06e9e830e3481996e5ad72b1bb04109f40 SHA-256: abac19bd44a8138e5defab6d2cc04331b8a8fae6f947c1ea9536ab5da9d1ea3b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The file also functions as a link farm, pointing to numerous URLs, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of embedded JavaScript and the link farm structure strongly indicate an intent to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://locoffice.ru/userfiles/file/dufagenenozikaxisezaduta.pdf In PDF document text
    • https://imaggu.com/ci/userfiles/files/65547148576.pdfIn PDF document text
    • https://titishop.co/upload/files/zemufuwi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/17437930903.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/wagunikufosov.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/defojomokafofuzakutevipiw.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/wajaga.pdfIn PDF document text
    • http://moretonassets.net/userfiles/xofolugofimipizonowiwo.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/zewulazasozupavefi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614144097d8ec---pibazigigexetatukojupikav.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/guxeliguwodasige.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/alv16vfr01l46o28ddmbrg2vu0/2277941558.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/sazaxabaxowapalaranag.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/durixe.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/29196508885.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/b0icukq19895h55lt7lhbvf3j4/vorimilesubenaribujam.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614660e0049d8---61205264888.pdfIn PDF document text
    • http://samurairamenbar.com/uploads/files/98944916543.pdfIn PDF document text
    • http://vikohasanfiber.com/upload/files/waxenisunekax.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16140f398c5bb0---jukixina.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210908_145820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=present+continuous+and+simple+present+exercises+pdfPDF 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_off0000cc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1B 10984 bytes
SHA-256: aea4ea24f3e3d0ce131a3095ee61bfda2218d44ee6991a8a6572d0eb775a202c
font_01_sfnt_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 17356 bytes
SHA-256: 68013bc0a608ab0f9830aadae132d7795ef1f522029b4fe8d2752de7872cb30e
font_02_sfnt_off000112a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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