Malicious PDF — malware analysis report

Static analysis result for SHA-256 be202a1893abe81f…

MALICIOUS

PDF

87.3 KB Created: 2021-09-10 11:27:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 828e47dd74fe8a44600252b78843ce5d SHA-1: 4b8d6f0fd23b1d0002a7292c6243541d33b31ff9 SHA-256: be202a1893abe81f56cd81b720b96edf885a44dd019892e0083f540db6d19247
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://laborke.ru/uplcv?utm_term=abrir+aplicativo+android+no+pc PDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161318df726505---dupasigezezizopa.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ed7aa4ef6eda6f8197c360b3ff071f9c/74545626983.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/kenavodamifimepubuwuwe.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3bb268f1---89280403873.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/ludepor.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/8801474549.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/59029141668.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/81294787911.pdfIn PDF document text
    • http://immopolignano.lu/images/13036587690.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137a615da5a2---54344081085.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132f15d09237---ragitezekuxipilex.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef976e1b7---9987426282.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/5pu1e7tibdocij8o2e3bg4640s/54263371742.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/gageg.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/96440244248.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/zarixobajutuzeduzuledap.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/nidoko.pdfIn PDF document text
    • https://ultralloy.net/upload/files/82881589652.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///pexetomizupusini.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/xovemirijug.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/xiferez.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/43418785636.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_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 10392 bytes
SHA-256: 16678ed77186c50adceaf79fd2d1797ad92e5bb9afe0105c03c68c0ad912761f
font_01_sfnt_off00010653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10653 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E65 19228 bytes
SHA-256: f17a34e62150373aca000480082a73159f1180273a0382c3f802138503972a94

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