Malicious PDF — malware analysis report

Static analysis result for SHA-256 377be9b4d1301b26…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 13:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b433d0961cff8d37f79958e591eeaea SHA-1: 11a76b9452c73a58cf3c8ed8c95c180c04aaf4f7 SHA-256: 377be9b4d1301b26fb8afc2e116c8e196d90ddd6590b316658ff07df4edaf22a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JS suggests an attempt to execute code or redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pitin-akutsu.com/js/upload/files/benoxodobigasimomo.pdf In PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/4s9qdbjl6dcv95kpm29cl8u85f/folijakoterisarepekig.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/luwuvegeronipudebaja.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/tajebupavor.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161420f1f57e08---20793778396.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/90964322429.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/mazar.pdfIn PDF document text
    • https://thebottombillion.com/business_school/uploads/file/todudigis.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161410e3caeced---ximeginamogokatixulota.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/58958309838.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/mesezoluburomo.pdfIn PDF document text
    • http://mevlanaasm.com/resimler/files/bepomivumuf.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/nagorivepubatow.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/89314249440.pdfIn PDF document text
    • http://cl-pub.com/files/files/potodojosefavovetame.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/afgpocur5tqfhp65d53hss5o7l/xotiguwekarejubo.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/49153522217.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/7552165669.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/jivipaf.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/xuren.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/rizolutojetoxejamez.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/buzopetobakabonisabi.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/62012802889.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/dalumumimep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=c64+emulator+android+apkPDF 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_off0000ceae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAE 10856 bytes
SHA-256: d7ced8e7da00ef5a24e3c4b753903966ac0e88eb8b7b898ff05f98c6495873dc
font_01_sfnt_off0000e7bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BB 17648 bytes
SHA-256: a9cc35e704113436cf1fca0d4c98d2885195348c62bf44b404e1552b6db3db2d
font_02_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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