Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abbeb5972091970…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 09:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd9b050a253174965160428b92d4341d SHA-1: 7d98272acdacc34f602fa53e55b4ca7e9a441247 SHA-256: 5abbeb5972091970874fa72454a4e979c41fd2d4f2d54e5477586acb0dbfe890
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS platforms, suggesting an attempt to obscure the final malicious destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document may be part of a multi-stage attack, possibly requiring a password to decrypt a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ferrocom-spb.ru/userfiles/files/gevakefadunopaja.pdf In PDF document text
    • https://debcopharma.com/userfiles/file/dalusuvigolig.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/f67904449b921f7dbe04143009fbb655/legufetuwobizadonumiwud.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631602451.pdfIn PDF document text
    • http://fitviewer.info/files/file/69007800090.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/nujawavi.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/11/file/20210911_114743_160.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/62266301385.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/67648898171.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/vavifizugud.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/33629980691.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/ferimatibupexo.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/72620015531.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gofib.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/nerifex.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/92699277805.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/80827837118.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/22844497035.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a32feeb93d---kurukoxifedofupew.pdfIn PDF document text
    • http://vodnik48.ru/content/file/29735595716.pdfIn PDF document text
    • http://chenruichem.com/upload/files/67814243711.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613927286255a---70689037093.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/gebinulujatifawanorasot.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/lofijinisab.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/sanebi.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/63033691507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=network+reset+androidPDF 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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9E 17772 bytes
SHA-256: 8c01f0574cfede6b90fdb65a4fec0a2a13c56e55b7e6b6773eaa8530c4446397
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 10352 bytes
SHA-256: 96cac67549615b48ab29e0bdb5c65bda23b62d010462fe08fd4ee2797a90a4b4

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