Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f7fe0453389175…

MALICIOUS

PDF

92.7 KB Created: 2021-09-05 09:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6eef790c529e2bb150c1feff9b5024b8 SHA-1: 4c59ad7bc43affab191bc8b6094be3b5f16f3384 SHA-256: e7f7fe04533891755f42e73f9cc3fb5f65f3f913a932296d9762e0d4fbdc91a5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell. This, combined with embedded URLs pointing to potentially compromised sites, indicates an attempt to trick the user into executing commands, likely to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://crysiq.ru/uplcv?utm_term=windows+subsystem+for+linux+manual+download PDF link annotation
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/5a52c82d09c540978e0a6c1babd4e07e/58076138748.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/18404981950.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6be87a2522---zezope.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/zukojenukurixujo.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/gaxuwizotorikomaxibaxonap.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/31221240073.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2c7a9add98beb7c42fc310ca028735cc/51539446982.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/gopijanunijusoje.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/13354111762.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/pobinafegew.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accef6a7766---ziwagela.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e671ff8cad1---43479420814.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/db23332e9d4a1dd866c911bdc22b2114/49306000490.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8143ee604389b06db8200a0f68724594/vufewopozod.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/zafas.pdfIn PDF document text
    • http://nhadephoanhao.vn/upload/ckupload/files/gumituvazifedelovu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/74042110547.pdfIn PDF document text
    • http://delve-cr.com/uploads/vaxegoniwuseg.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/mefirobakonak.pdfIn PDF document text
    • http://hkalc.com/userfiles/gosolido.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/zowaduzaruvavikiw.pdfIn PDF document text
    • http://aprt1day.ru/file/faxozakukax.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/lojupinixipulilowibib.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e16e09036c5853fb7ebed834f0e2f8d2/8416031138.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/lunawigukale.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2041503bff79f684d8892297335e272f/lugunitonulosovilupumez.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_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11933 19096 bytes
SHA-256: 00bf65c9ff196ccf82aad93b5fea9d3c276788b29e04e6ec5fcde2bc1a47ec65
font_02_sfnt_off00014b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B10 11052 bytes
SHA-256: 42133f7e3a163413a58c952215b962fab4b30f8dcec8914fc04902441f40dd24

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