Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a22c838b51c87f2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 12:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3acf5377a508c9632d3ce7d32ace71c3 SHA-1: 9522ed527c10c433a438610c4f76717ca2187cc2 SHA-256: 1a22c838b51c87f2d003d4e537bc6e5d9305cacdee5e69446d1e7c49d7893521
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The heuristic 'SE_CLOUD_DOC_LURE' strongly suggests the document impersonates a cloud file-sharing service to trick the user into clicking a malicious link. The embedded JavaScript likely facilitates the execution of further malicious actions, such as downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://ecohort.com/userfiles/files/31358992880.pdf In PDF document text
    • https://bczenekar.hu/files/file/koxemamidolojo.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a729b2a84---68488594006.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/limigenufuta.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/37399887361.pdfIn PDF document text
    • https://lazerom.pro/media/file/51627038589.pdfIn PDF document text
    • https://rajaunited.com/contents/files/9215120226.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/dogiviwagirazij.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614934122f9ca---79466384816.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/80602519531.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/sisulomizonixo.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/fd92d116c3aa1659dd8952045990c737/tepatodo.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/89806140501.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/nifuwimogubotojo.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/12495300708.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/43900108932.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/13910347674.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/xukepanamakavewomemujam.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/22696844809.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210921053702.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141e82235709---riluju.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417586cae3b---wuxikenebajobulofo.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/21479381984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+share+android+to+ipadPDF 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_off0000d2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 17300 bytes
SHA-256: 9d3b65033314da307e09c1a8c172296286b00f67b9986fdef224c6d33c894e9b
font_02_sfnt_off00011727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11727 10520 bytes
SHA-256: af73c53287abff4408fca0b2ca3116eb29b03787ff7e5c413000ddf894745237

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