Malicious PDF — malware analysis report

Static analysis result for SHA-256 56e272e5df6c3cec…

MALICIOUS

PDF

96.4 KB Created: 2021-09-22 15:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9b18483556bbdf4b7b6909297e347573 SHA-1: c7dacfc19d1f7ddd8a1f08a1a03f22bacbb2d675 SHA-256: 56e272e5df6c3cece9c196c1a70607cf04b28b9055f8a804522430f2edad49a9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document employs social engineering tactics, including an urgency lure and a fake download button, to prompt the user to install a browser extension or update. The ML classifier strongly indicated maliciousness, and numerous URLs were extracted, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The primary goal appears to be tricking the user into executing a malicious file disguised as a necessary update.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 8

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://archism.ru/uplcv?utm_term=friends+english+subtitles+season+3 PDF link annotation
    • http://matsonconstruction.net/userfiles/file/molajovowusazukugeko.pdfIn PDF document text
    • http://effekt-film.de/files/file/xovafixanefotakoxawedesaw.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34520360466.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/dozide.pdfIn PDF document text
    • https://atiksigorta.com/files/mafunosapen.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161329fbe5b009---28097581720.pdfIn PDF document text
    • http://xhzhengli.com/upload/56542486715.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/nagerixizokoju.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a349fe3f2f---taselovunoguvisefas.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/pimowopilu.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/56060435452.pdfIn PDF document text
    • http://moretonassets.net/userfiles/dukusuxasi.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210921_18FC24AE08E35AB5.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/rarinokijesiteru.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-8/20210908223316882975.pdfIn PDF document text
    • http://canadanur.com/resimler/files/wakiduligiwuje.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/75813035120.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/094f494ae0a3e1449029020f30589165/debatamikal.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/86184561793.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/bobet.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/27706842481d410453d3e66131483d15/91162069330.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c652edb6db---mukulenunumowevilurevuf.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 10916 bytes
SHA-256: 6cc43c0630fadd4db01657af9f5e8452c2a88e9b44360e01f00559f0d033fbd3
font_01_sfnt_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_02_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 25340 bytes
SHA-256: 8fe649e1a7d477d14c1b7f78a364f88cb632f58a02185fa69c0ff89f1a2ccffd
font_03_sfnt_off00015204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15204 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016a11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A11 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729

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